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<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2023-09-01 20:40:40 / 修改时间：20:47:46" itemprop="dateCreated datePublished" datetime="2023-09-01T20:40:40+08:00">2023-09-01</time>
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<h3 id="背景描述"><a href="#背景描述" class="headerlink" title="背景描述"></a>背景描述</h3><p>实现一个虚拟滚动组件，可以满足列表和瀑布流两种模式</p>
<p>线上预览环境</p>
<p><a target="_blank" rel="noopener" href="https://codesandbox.io/s/dong-tai-gao-du-xu-ni-gun-dong-4945px?file=/Masonry.tsx">https://codesandbox.io/s/dong-tai-gao-du-xu-ni-gun-dong-4945px?file=/Masonry.tsx</a></p>
<p>具体代码实现可以看以上链接</p>
<p>动态高度的计算是在子项渲染之后做的，因此在渲染的时候这里会渲染两次，一次是预渲染，一次是计算过后的渲染</p>
<p>实现高度的组件思路类似，具体可以看代码：</p>
<figure class="highlight tsx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> <span class="title class_">React</span>, { useRef, useEffect } <span class="keyword">from</span> <span class="string">"react"</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">const</span> <span class="title function_">RowRenderer</span> = (<span class="params">{</span></span><br><span class="line"><span class="params"> index,</span></span><br><span class="line"><span class="params"> isScrolling,</span></span><br><span class="line"><span class="params"> key,</span></span><br><span class="line"><span class="params"> style,</span></span><br><span class="line"><span class="params"> state,</span></span><br><span class="line"><span class="params"> render,</span></span><br><span class="line"><span class="params"> setRowHeight</span></span><br><span class="line"><span class="params">}</span>) => {</span><br><span class="line"> <span class="keyword">const</span> rowRef = useRef<<span class="title class_">HTMLDivElement</span> | <span class="literal">null</span>>(<span class="literal">null</span>);</span><br><span class="line"> <span class="keyword">const</span> { showScrollingPlaceholder } = state;</span><br><span class="line"> <span class="keyword">const</span> placeholderContent = (</span><br><span class="line"> <span class="language-xml"><span class="tag"><<span class="name">div</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> // <span class="attr">className</span>=<span class="string">{clsx(styles.row,</span> <span class="attr">styles.isScrollingPlaceholder</span>)}</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">key</span>=<span class="string">{key}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">style</span>=<span class="string">{style}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> ></span></span></span><br><span class="line"><span class="language-xml"> Scrolling...</span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">div</span>></span></span></span><br><span class="line"> );</span><br><span class="line"></span><br><span class="line"> <span class="title function_">useEffect</span>(<span class="function">() =></span> {</span><br><span class="line"> <span class="keyword">if</span> (rowRef) {</span><br><span class="line"> <span class="title function_">setRowHeight</span>(index, rowRef.<span class="property">current</span>.<span class="property">clientHeight</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="function">() =></span> {};</span><br><span class="line"> }, [rowRef, index]);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> showScrollingPlaceholder && isScrolling ? (</span><br><span class="line"> <span class="language-xml"><span class="tag"><<span class="name">div</span>></span>{placeholderContent}<span class="tag"></<span class="name">div</span>></span></span></span><br><span class="line"> ) : (</span><br><span class="line"> <span class="language-xml"><span class="tag"><<span class="name">div</span> <span class="attr">key</span>=<span class="string">{key}</span> <span class="attr">className</span>=<span class="string">"row"</span> <span class="attr">style</span>=<span class="string">{style}</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">div</span> <span class="attr">ref</span>=<span class="string">{rowRef}</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">div</span>></span>{render()}<span class="tag"></<span class="name">div</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">div</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">div</span>></span></span></span><br><span class="line"> );</span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> <span class="title class_">RowRenderer</span>;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<p>如果只是需要实现虚拟列表模式，可以考虑用<code>react-window</code>来实现，因为这个库更小，这里使用了<code>react-virtualized</code>是因为react-window支持的是网格布局，而瀑布流不属于网格布局，所以对于react-window的话不考虑</p>
<p>来看列表的实现：<br>示例代码，基本可以直接用，有额外需要可以自己做修改</p>
<figure class="highlight tsx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> <span class="title class_">React</span>, { useEffect, useRef, useState } <span class="keyword">from</span> <span class="string">"react"</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> { <span class="title class_">AutoSizer</span>, <span class="title class_">List</span> } <span class="keyword">from</span> <span class="string">"react-virtualized"</span>;</span><br><span class="line"><span class="keyword">import</span> <span class="string">"./list.css"</span>;</span><br><span class="line"><span class="keyword">import</span> <span class="title class_">RowRenderer</span> <span class="keyword">from</span> <span class="string">"./Rowrenderer"</span>;</span><br><span class="line"><span class="keyword">interface</span> <span class="title class_">Props</span><T <span class="keyword">extends</span> <span class="title class_">Record</span><<span class="built_in">string</span>, <span class="built_in">any</span>>> {</span><br><span class="line"> <span class="attr">children</span>: <span class="function">(<span class="params">p: { index; isScrolling?: <span class="built_in">boolean</span>; item: T }</span>) =></span> <span class="title class_">React</span>.<span class="property">ReactNode</span>;</span><br><span class="line"> <span class="attr">data</span>: T[];</span><br><span class="line"> height?: <span class="built_in">number</span>;</span><br><span class="line">}</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> <span class="keyword">function</span> <span class="title class_">VirtualList</span><T <span class="keyword">extends</span> <span class="title class_">Record</span><<span class="built_in">string</span>, <span class="built_in">any</span>>>({</span><br><span class="line"> data,</span><br><span class="line"> height = <span class="number">400</span>,</span><br><span class="line"> children</span><br><span class="line">}: <span class="title class_">Props</span><T>) {</span><br><span class="line"> <span class="keyword">const</span> listRef = useRef<<span class="title class_">List</span>>();</span><br><span class="line"> <span class="keyword">const</span> itemCount = data?.<span class="property">length</span>;</span><br><span class="line"> <span class="keyword">const</span> [state, setState] = <span class="title function_">useState</span>({</span><br><span class="line"> <span class="attr">listHeight</span>: height,</span><br><span class="line"> <span class="attr">listRowHeight</span>: <span class="number">50</span>,</span><br><span class="line"> <span class="attr">overscanRowCount</span>: <span class="number">10</span>,</span><br><span class="line"> <span class="attr">rowCount</span>: itemCount,</span><br><span class="line"> <span class="attr">scrollToIndex</span>: <span class="literal">undefined</span>,</span><br><span class="line"> <span class="attr">showScrollingPlaceholder</span>: <span class="literal">false</span>,</span><br><span class="line"> <span class="attr">useDynamicRowHeight</span>: <span class="literal">false</span></span><br><span class="line"> });</span><br><span class="line"> <span class="keyword">const</span> rowHeight = <span class="title function_">useRef</span>({});</span><br><span class="line"></span><br><span class="line"> <span class="keyword">const</span> <span class="title function_">setRowHeight</span> = (<span class="params">index: <span class="built_in">number</span>, value: <span class="built_in">number</span></span>) => {</span><br><span class="line"> rowHeight.<span class="property">current</span> = {</span><br><span class="line"> ...rowHeight.<span class="property">current</span>,</span><br><span class="line"> [index]: value</span><br><span class="line"> };</span><br><span class="line"></span><br><span class="line"> listRef.<span class="property">current</span>.<span class="title function_">recomputeRowHeights</span>();</span><br><span class="line"> };</span><br><span class="line"> <span class="keyword">const</span> <span class="title function_">_getRowHeight</span> = (<span class="params">{ index }</span>) => {</span><br><span class="line"> <span class="keyword">return</span> rowHeight.<span class="property">current</span>[index] || state.<span class="property">listRowHeight</span>;</span><br><span class="line"> };</span><br><span class="line"> <span class="keyword">return</span> (</span><br><span class="line"> <span class="language-xml"><span class="tag"><<span class="name">AutoSizer</span> <span class="attr">disableHeight</span>></span></span></span><br><span class="line"><span class="language-xml"> {({ width }) => {</span></span><br><span class="line"><span class="language-xml"> return (</span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">List</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">ref</span>=<span class="string">{listRef}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">className</span>=<span class="string">{</span>"<span class="attr">List</span>"}</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">height</span>=<span class="string">{state.listHeight}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">overscanRowCount</span>=<span class="string">{state.overscanRowCount}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> // <span class="attr">noRowsRenderer</span>=<span class="string">{this._noRowsRenderer}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">rowCount</span>=<span class="string">{state.rowCount}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">rowHeight</span>=<span class="string">{_getRowHeight}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">rowRenderer</span>=<span class="string">{({</span> <span class="attr">index</span>, <span class="attr">isScrolling</span>, <span class="attr">key</span>, <span class="attr">style</span> }) =></span> {</span></span><br><span class="line"><span class="language-xml"> return (</span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">RowRenderer</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">index</span>=<span class="string">{index}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">isScrolling</span>=<span class="string">{isScrolling}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">style</span>=<span class="string">{style}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">key</span>=<span class="string">{key}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">setRowHeight</span>=<span class="string">{setRowHeight}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">render</span>=<span class="string">{()</span> =></span> {</span></span><br><span class="line"><span class="language-xml"> return children({ index, isScrolling, item: data[index] });</span></span><br><span class="line"><span class="language-xml"> }}</span></span><br><span class="line"><span class="language-xml"> state={state}</span></span><br><span class="line"><span class="language-xml"> /></span></span><br><span class="line"><span class="language-xml"> );</span></span><br><span class="line"><span class="language-xml"> }}</span></span><br><span class="line"><span class="language-xml"> scrollToIndex={state.scrollToIndex}</span></span><br><span class="line"><span class="language-xml"> width={width}</span></span><br><span class="line"><span class="language-xml"> /></span></span><br><span class="line"><span class="language-xml"> );</span></span><br><span class="line"><span class="language-xml"> }}</span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">AutoSizer</span>></span></span></span><br><span class="line"> );</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<p>这是瀑布流的实现:</p>
<figure class="highlight tsx"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br><span class="line">142</span><br><span class="line">143</span><br><span class="line">144</span><br><span class="line">145</span><br><span class="line">146</span><br><span class="line">147</span><br><span class="line">148</span><br><span class="line">149</span><br><span class="line">150</span><br><span class="line">151</span><br><span class="line">152</span><br><span class="line">153</span><br><span class="line">154</span><br><span class="line">155</span><br><span class="line">156</span><br><span class="line">157</span><br><span class="line">158</span><br><span class="line">159</span><br><span class="line">160</span><br><span class="line">161</span><br><span class="line">162</span><br><span class="line">163</span><br><span class="line">164</span><br><span class="line">165</span><br><span class="line">166</span><br><span class="line">167</span><br><span class="line">168</span><br><span class="line">169</span><br><span class="line">170</span><br><span class="line">171</span><br><span class="line">172</span><br><span class="line">173</span><br><span class="line">174</span><br><span class="line">175</span><br><span class="line">176</span><br><span class="line">177</span><br><span class="line">178</span><br><span class="line">179</span><br><span class="line">180</span><br><span class="line">181</span><br><span class="line">182</span><br><span class="line">183</span><br><span class="line">184</span><br><span class="line">185</span><br><span class="line">186</span><br><span class="line">187</span><br><span class="line">188</span><br><span class="line">189</span><br><span class="line">190</span><br><span class="line">191</span><br><span class="line">192</span><br><span class="line">193</span><br><span class="line">194</span><br><span class="line">195</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> <span class="title class_">React</span>, { useEffect, useRef } <span class="keyword">from</span> <span class="string">"react"</span>;</span><br><span class="line"><span class="keyword">import</span> {</span><br><span class="line"> <span class="title class_">AutoSizer</span>,</span><br><span class="line"> <span class="title class_">CellMeasurer</span>,</span><br><span class="line"> <span class="title class_">CellMeasurerCache</span>,</span><br><span class="line"> <span class="title class_">Masonry</span></span><br><span class="line">} <span class="keyword">from</span> <span class="string">"react-virtualized"</span>;</span><br><span class="line"><span class="keyword">import</span> { createCellPositioner } <span class="keyword">from</span> <span class="string">"react-virtualized/dist/es/Masonry"</span>;</span><br><span class="line"><span class="keyword">interface</span> <span class="title class_">Props</span> {</span><br><span class="line"> <span class="attr">itemCount</span>: <span class="built_in">number</span>;</span><br><span class="line"> <span class="attr">children</span>: <span class="function">(<span class="params">{</span></span></span><br><span class="line"><span class="params"><span class="function"> index,</span></span></span><br><span class="line"><span class="params"><span class="function"> isScrolling</span></span></span><br><span class="line"><span class="params"><span class="function"> }: {</span></span></span><br><span class="line"><span class="params"><span class="function"> index: <span class="built_in">number</span>;</span></span></span><br><span class="line"><span class="params"><span class="function"> isScrolling: <span class="built_in">boolean</span>;</span></span></span><br><span class="line"><span class="params"><span class="function"> }</span>) =></span> <span class="title class_">React</span>.<span class="property">ReactNode</span>;</span><br><span class="line"> height?: <span class="built_in">number</span>;</span><br><span class="line">}</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> <span class="keyword">function</span> <span class="title function_">VirtualMasonry</span>(<span class="params">{</span></span><br><span class="line"><span class="params"> itemCount,</span></span><br><span class="line"><span class="params"> children,</span></span><br><span class="line"><span class="params"> height = <span class="number">300</span></span></span><br><span class="line"><span class="params">}: Props</span>) {</span><br><span class="line"> <span class="keyword">const</span> cache = <span class="title function_">useRef</span>(</span><br><span class="line"> <span class="keyword">new</span> <span class="title class_">CellMeasurerCache</span>({</span><br><span class="line"> <span class="attr">defaultHeight</span>: <span class="number">250</span>,</span><br><span class="line"> <span class="attr">defaultWidth</span>: <span class="number">200</span>,</span><br><span class="line"> <span class="attr">fixedWidth</span>: <span class="literal">true</span></span><br><span class="line"> })</span><br><span class="line"> );</span><br><span class="line"> <span class="keyword">const</span> state = <span class="title function_">useRef</span>({</span><br><span class="line"> <span class="attr">columnWidth</span>: <span class="number">200</span>,</span><br><span class="line"> height,</span><br><span class="line"> <span class="attr">gutterSize</span>: <span class="number">10</span>,</span><br><span class="line"> <span class="attr">overscanByPixels</span>: <span class="number">0</span>,</span><br><span class="line"> <span class="attr">windowScrollerEnabled</span>: <span class="literal">false</span></span><br><span class="line"> });</span><br><span class="line"> <span class="keyword">const</span> width = <span class="title function_">useRef</span>(<span class="number">0</span>);</span><br><span class="line"> <span class="keyword">const</span> columnCount = <span class="title function_">useRef</span>(<span class="number">0</span>);</span><br><span class="line"> <span class="keyword">const</span> scrollTopRefVal = <span class="title function_">useRef</span>(<span class="number">0</span>);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">const</span> cellPositioner = <span class="title function_">useRef</span>(</span><br><span class="line"> <span class="title function_">createCellPositioner</span>({</span><br><span class="line"> <span class="attr">cellMeasurerCache</span>: cache.<span class="property">current</span>,</span><br><span class="line"> <span class="attr">columnCount</span>: columnCount.<span class="property">current</span>,</span><br><span class="line"> <span class="attr">columnWidth</span>: state.<span class="property">current</span>.<span class="property">columnWidth</span>,</span><br><span class="line"> <span class="attr">spacer</span>: state.<span class="property">current</span>.<span class="property">gutterSize</span></span><br><span class="line"> })</span><br><span class="line"> );</span><br><span class="line"> <span class="keyword">const</span> masonryRef = <span class="title function_">useRef</span>();</span><br><span class="line"> <span class="keyword">const</span> <span class="title function_">setMasonryRef</span> = (<span class="params">ref</span>) => {</span><br><span class="line"> masonryRef.<span class="property">current</span> = ref;</span><br><span class="line"> };</span><br><span class="line"></span><br><span class="line"> <span class="keyword">const</span> <span class="title function_">resetCellPositioner</span> = (<span class="params"></span>) => {</span><br><span class="line"> <span class="keyword">const</span> { columnWidth, gutterSize } = state.<span class="property">current</span>;</span><br><span class="line"> <span class="keyword">if</span> (!cellPositioner) <span class="keyword">return</span>;</span><br><span class="line"> cellPositioner.<span class="property">current</span>?.<span class="property">reset</span>?.({</span><br><span class="line"> <span class="attr">columnCount</span>: columnCount.<span class="property">current</span>,</span><br><span class="line"> columnWidth,</span><br><span class="line"> <span class="attr">spacer</span>: gutterSize</span><br><span class="line"> });</span><br><span class="line"> };</span><br><span class="line"></span><br><span class="line"> <span class="keyword">const</span> <span class="title function_">calculateColumnCount</span> = (<span class="params"></span>) => {</span><br><span class="line"> <span class="keyword">const</span> { columnWidth, gutterSize } = state.<span class="property">current</span>;</span><br><span class="line"></span><br><span class="line"> columnCount.<span class="property">current</span> = <span class="title class_">Math</span>.<span class="title function_">floor</span>(</span><br><span class="line"> width.<span class="property">current</span> / (columnWidth + gutterSize)</span><br><span class="line"> );</span><br><span class="line"> };</span><br><span class="line"> <span class="keyword">const</span> <span class="title function_">onResize</span> = (<span class="params">{ width: w }</span>) => {</span><br><span class="line"> width.<span class="property">current</span> = w;</span><br><span class="line"> <span class="comment">// 重新计算列的个数</span></span><br><span class="line"> <span class="title function_">calculateColumnCount</span>();</span><br><span class="line"> <span class="comment">// 根据列的个数重新计算位置</span></span><br><span class="line"> <span class="title function_">resetCellPositioner</span>();</span><br><span class="line"> <span class="comment">// 让组件根据位置重新计算</span></span><br><span class="line"> <span class="keyword">if</span> (masonryRef) masonryRef?.<span class="property">current</span>?.<span class="property">recomputeCellPositions</span>?.();</span><br><span class="line"> };</span><br><span class="line"> <span class="title function_">useEffect</span>(<span class="function">() =></span> {</span><br><span class="line"> <span class="comment">// 初始化宽度</span></span><br><span class="line"> <span class="title function_">calculateColumnCount</span>();</span><br><span class="line"> }, [width]);</span><br><span class="line"> <span class="title function_">useEffect</span>(<span class="function">() =></span> {</span><br><span class="line"> <span class="comment">// 初始化cell position</span></span><br><span class="line"></span><br><span class="line"> cellPositioner.<span class="property">current</span> = <span class="title function_">createCellPositioner</span>({</span><br><span class="line"> <span class="attr">cellMeasurerCache</span>: cache.<span class="property">current</span>,</span><br><span class="line"> <span class="attr">columnCount</span>: columnCount.<span class="property">current</span>,</span><br><span class="line"> <span class="attr">columnWidth</span>: state.<span class="property">current</span>.<span class="property">columnWidth</span>,</span><br><span class="line"> <span class="attr">spacer</span>: state.<span class="property">current</span>.<span class="property">gutterSize</span></span><br><span class="line"> });</span><br><span class="line"> <span class="comment">// console.info("effect:", cellPositioner.current);</span></span><br><span class="line"> }, [columnCount]);</span><br><span class="line"> <span class="comment">// console.info("out:", cellPositioner.current);</span></span><br><span class="line"> <span class="keyword">const</span> rowHeight = <span class="title function_">useRef</span>({});</span><br><span class="line"> <span class="keyword">const</span> <span class="title function_">setRowHeight</span> = (<span class="params">index, value</span>) => {</span><br><span class="line"> rowHeight.<span class="property">current</span> = {</span><br><span class="line"> ...rowHeight.<span class="property">current</span>,</span><br><span class="line"> [index]: value</span><br><span class="line"> };</span><br><span class="line"> <span class="comment">// onResize({ width: width.current });</span></span><br><span class="line"> };</span><br><span class="line"> <span class="keyword">const</span> <span class="title function_">CellRenderer</span> = (<span class="params">{ index, key, parent, style, isScrolling }</span>) => {</span><br><span class="line"> <span class="keyword">const</span> { columnWidth } = state.<span class="property">current</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">const</span> divRef = useRef<<span class="title class_">HTMLDivElement</span> | <span class="literal">null</span>>(<span class="literal">null</span>);</span><br><span class="line"> <span class="title function_">useEffect</span>(<span class="function">() =></span> {</span><br><span class="line"> <span class="keyword">if</span> (divRef) {</span><br><span class="line"> <span class="title function_">setRowHeight</span>(index, divRef.<span class="property">current</span>.<span class="property">clientHeight</span>);</span><br><span class="line"> }</span><br><span class="line"> }, [divRef]);</span><br><span class="line"> <span class="keyword">return</span> (</span><br><span class="line"> <span class="language-xml"><span class="tag"><<span class="name">CellMeasurer</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">cache</span>=<span class="string">{cache.current}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">index</span>=<span class="string">{index}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">key</span>=<span class="string">{key}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">parent</span>=<span class="string">{parent}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> ></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">div</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">style</span>=<span class="string">{{</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">...style</span>,</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">width:</span> <span class="attr">columnWidth</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> }}</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> ></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">div</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">ref</span>=<span class="string">{divRef}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">style</span>=<span class="string">{{</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">backgroundColor:</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> "#" + <span class="attr">Math.floor</span>(<span class="attr">Math.random</span>() * <span class="attr">16777215</span>)<span class="attr">.toString</span>(<span class="attr">16</span>),</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">borderRadius:</span> "<span class="attr">0.5rem</span>",</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">height:</span> <span class="attr">rowHeight.current</span>[<span class="attr">index</span>],</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">marginBottom:</span> "<span class="attr">0.5rem</span>",</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">width:</span> "<span class="attr">100</span>%",</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">fontSize:</span> <span class="attr">20</span>,</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">color:</span> "<span class="attr">white</span>",</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">display:</span> "<span class="attr">flex</span>",</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">alignItems:</span> "<span class="attr">center</span>",</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">justifyContent:</span> "<span class="attr">center</span>"</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> }}</span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> ></span></span></span><br><span class="line"><span class="language-xml"> {children({ index, isScrolling })}</span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">div</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">div</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">CellMeasurer</span>></span></span></span><br><span class="line"> );</span><br><span class="line"> };</span><br><span class="line"></span><br><span class="line"> <span class="keyword">const</span> <span class="title function_">renderMasonry</span> = (<span class="params">{ width: w }</span>) => {</span><br><span class="line"> width.<span class="property">current</span> = w;</span><br><span class="line"> <span class="keyword">return</span> (</span><br><span class="line"> <span class="language-xml"><span class="tag"><<span class="name">Masonry</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">autoHeight</span>=<span class="string">{false}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">cellCount</span>=<span class="string">{itemCount}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">cellMeasurerCache</span>=<span class="string">{cache.current}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">cellPositioner</span>=<span class="string">{cellPositioner.current}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">cellRenderer</span>=<span class="string">{({</span> <span class="attr">index</span>, <span class="attr">key</span>, <span class="attr">parent</span>, <span class="attr">style</span>, <span class="attr">isScrolling</span> }) =></span> {</span></span><br><span class="line"><span class="language-xml"> return (</span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">CellRenderer</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">index</span>=<span class="string">{index}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">key</span>=<span class="string">{key}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">parent</span>=<span class="string">{parent}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">style</span>=<span class="string">{style}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">isScrolling</span>=<span class="string">{isScrolling}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> /></span></span></span><br><span class="line"><span class="language-xml"> );</span></span><br><span class="line"><span class="language-xml"> }}</span></span><br><span class="line"><span class="language-xml"> height={state.current.height}</span></span><br><span class="line"><span class="language-xml"> overscanByPixels={state.current.overscanByPixels}</span></span><br><span class="line"><span class="language-xml"> ref={setMasonryRef}</span></span><br><span class="line"><span class="language-xml"> scrollTop={scrollTopRefVal.current}</span></span><br><span class="line"><span class="language-xml"> width={w}</span></span><br><span class="line"><span class="language-xml"> /></span></span><br><span class="line"> );</span><br><span class="line"> };</span><br><span class="line"> <span class="keyword">const</span> <span class="title function_">renderAutoSizer</span> = (<span class="params">{ height, scrollTop }</span>) => {</span><br><span class="line"> scrollTopRefVal.<span class="property">current</span> = scrollTop;</span><br><span class="line"> <span class="keyword">return</span> (</span><br><span class="line"> <span class="language-xml"><span class="tag"><<span class="name">AutoSizer</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">disableHeight</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">height</span>=<span class="string">{height}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">onResize</span>=<span class="string">{onResize}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">overscanByPixels</span>=<span class="string">{state.current.overscanByPixels}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> <span class="attr">scrollTop</span>=<span class="string">{scrollTopRefVal.current}</span></span></span></span><br><span class="line"><span class="tag"><span class="language-xml"> ></span></span></span><br><span class="line"><span class="language-xml"> {renderMasonry}</span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">AutoSizer</span>></span></span></span><br><span class="line"> );</span><br><span class="line"> };</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="title function_">renderAutoSizer</span>({ <span class="attr">height</span>: state.<span class="property">current</span>.<span class="property">height</span>, <span class="attr">scrollTop</span>: <span class="number">0</span> });</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
</div>
<footer class="post-footer">
<div class="post-eof"></div>
</footer>
</article>
<article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-CN">
<link itemprop="mainEntityOfPage" href="https://fnlearner.github.io/2023/02/richTextForDraftJs/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="image" content="/images/avatar.png">
<meta itemprop="name" content="ZJS">
<meta itemprop="description" content="你找到我了呀！">
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<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="Personal Blog">
</span>
<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a href="/2023/02/richTextForDraftJs/" class="post-title-link" itemprop="url">基于DraftJS实现的计算表达式</a>
</h2>
<div class="post-meta">
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<span class="post-meta-item-icon">
<i class="far fa-calendar"></i>
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<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2023-02-27 22:30:32 / 修改时间：23:23:40" itemprop="dateCreated datePublished" datetime="2023-02-27T22:30:32+08:00">2023-02-27</time>
</span>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<html>
<embed src="/pdf/expression.pdf" type="application/pdf" width="100%" height="500px"
</html>
</div>
<footer class="post-footer">
<div class="post-eof"></div>
</footer>
</article>
<article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-CN">
<link itemprop="mainEntityOfPage" href="https://fnlearner.github.io/2022/06/imageFormat/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="image" content="/images/avatar.png">
<meta itemprop="name" content="ZJS">
<meta itemprop="description" content="你找到我了呀！">
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<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="Personal Blog">
</span>
<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a href="/2022/06/imageFormat/" class="post-title-link" itemprop="url">图片格式转换</a>
</h2>
<div class="post-meta">
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar"></i>
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<time title="创建时间：2022-06-12 14:00:10 / 修改时间：15:41:10" itemprop="dateCreated datePublished" datetime="2022-06-12T14:00:10+08:00">2022-06-12</time>
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</header>
<div class="post-body" itemprop="articleBody">
<html>
<body>
<input id="upload-input" type="file" accept="image/*" onchange="handleUpload()">
选择要转换的格式
<select id="format-select" onchange="handleChange()">
<option value="webp">
webp
</option>
<option value="png">
png
</option>
<option value="jpeg">
jpg
</option>
</select>
<button onclick="submit()">格式转换</button>
<!-- <canvas id="canvas" width="200" height="200"></canvas> -->
</body>
<script type="text/javascript">
const param = {
files:null,
format:'webp'
};
function handleUpload(){
const inputValue = document.getElementById('upload-input')
param.files = inputValue.files
};
function handleChange(){
const selectElement = document.getElementById('format-select')
const selectedIndex = selectElement.selectedIndex
const optionValue = selectElement.options[selectedIndex].value
param.format = optionValue
};
function submit(){
if(!param.files) {
window.alert('还没有选择文件')
return
}
const image = new Image()
const reader = new FileReader()
for(const item of param.files){
// const name = item.name
// console.info(item)
reader.readAsDataURL(item)
reader.onload = (data)=>{
const currentTarget = data.currentTarget
const result = currentTarget.result
image.crossOrigin = 'anonymous'
image.src = result
image.onload = (img)=>{
const canvas = document.createElement('canvas')
canvas.height = image.height
canvas.width = image.width
const ctx = canvas.getContext('2d')
ctx.drawImage(image,0,0)
const format = `image/${param.format}`
const url = canvas.toDataURL(format)
const a = document.createElement('a')
a.download = Date.now()
a.href = url
a.click()
}
}
}
}
</script>
</html>
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<footer class="post-footer">
<div class="post-eof"></div>
</footer>
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<article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-CN">
<link itemprop="mainEntityOfPage" href="https://fnlearner.github.io/2022/05/topDistance/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="image" content="/images/avatar.png">
<meta itemprop="name" content="ZJS">
<meta itemprop="description" content="你找到我了呀！">
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<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="Personal Blog">
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<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a href="/2022/05/topDistance/" class="post-title-link" itemprop="url">topDistance</a>
</h2>
<div class="post-meta">
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2022-05-24 20:52:20 / 修改时间：20:56:01" itemprop="dateCreated datePublished" datetime="2022-05-24T20:52:20+08:00">2022-05-24</time>
</span>
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</header>
<div class="post-body" itemprop="articleBody">
<p>计算某个DOM元素距离浏览器顶部的距离</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> * <span class="keyword">as</span> <span class="title class_">React</span> <span class="keyword">from</span> <span class="string">'react'</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> <span class="keyword">function</span> useTopDistance<T <span class="keyword">extends</span> <span class="title class_">HTMLDivElement</span>>(defaultInstance = <span class="number">24</span>) {</span><br><span class="line"> <span class="keyword">const</span> divRef = <span class="title class_">React</span>.<span class="property">useRef</span><T>(<span class="literal">null</span>);</span><br><span class="line"> <span class="keyword">const</span> [height, setHeight] = <span class="title class_">React</span>.<span class="title function_">useState</span>(<span class="number">0</span>);</span><br><span class="line"> <span class="comment">// 递归获取遍历到的元素的offsetTop</span></span><br><span class="line"> <span class="keyword">const</span> getElementInstanceToTop = (<span class="attr">el</span>: <span class="title class_">HTMLElement</span> | <span class="literal">null</span>): <span class="function"><span class="params">number</span> =></span> {</span><br><span class="line"> <span class="keyword">if</span> (el?.<span class="property">offsetParent</span>) {</span><br><span class="line"> <span class="keyword">return</span> <span class="title function_">getElementInstanceToTop</span>(el?.<span class="property">offsetParent</span> <span class="keyword">as</span> <span class="title class_">HTMLElement</span>) + el.<span class="property">offsetTop</span> + el.<span class="property">scrollTop</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> el ? el.<span class="property">offsetTop</span> : <span class="number">0</span>;</span><br><span class="line"> };</span><br><span class="line"> <span class="comment">// 重新计算高度，因为可能需要在填充数据的时候设置高度</span></span><br><span class="line"> <span class="keyword">const</span> calculateHeight = <span class="title class_">React</span>.<span class="title function_">useCallback</span>(<span class="function">() =></span> {</span><br><span class="line"> <span class="keyword">const</span> { clientHeight } = <span class="variable language_">document</span>.<span class="property">body</span>;</span><br><span class="line"> <span class="keyword">const</span> offsetParentTop = <span class="title function_">getElementInstanceToTop</span>(divRef.<span class="property">current</span>);</span><br><span class="line"> <span class="keyword">const</span> result = clientHeight - offsetParentTop ?? <span class="number">0</span>;</span><br><span class="line"> <span class="title function_">setHeight</span>(result - defaultInstance);</span><br><span class="line"> }, []);</span><br><span class="line"></span><br><span class="line"> <span class="title class_">React</span>.<span class="title function_">useLayoutEffect</span>(<span class="function">() =></span> {</span><br><span class="line"> <span class="variable language_">window</span>.<span class="title function_">requestAnimationFrame</span>(calculateHeight);</span><br><span class="line"> <span class="variable language_">window</span>.<span class="title function_">addEventListener</span>(<span class="string">'resize'</span>, calculateHeight);</span><br><span class="line"> <span class="keyword">return</span> <span class="function">() =></span> {</span><br><span class="line"> <span class="variable language_">window</span>.<span class="title function_">removeEventListener</span>(<span class="string">'resize'</span>, calculateHeight);</span><br><span class="line"> };</span><br><span class="line"> }, []);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> {</span><br><span class="line"> divRef,</span><br><span class="line"> height,</span><br><span class="line"> calculateHeight,</span><br><span class="line"> <span class="comment">// rafCalculateHeight: window.requestAnimationFrame(calculateHeight),</span></span><br><span class="line"> };</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
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<p>背景：给服务端发送请求的参数中有一个带有+号，并且在url中传递参数<br>问题：加号以空格的形式发送导致服务端不能正确处理数据<br>方案：使用<code>window.encodeURIComponent</code>对数据进行处理<br>以上</p>
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<h2 id="在使用antd的select中的search从远端获取数据时option渲染不符合预期行为，"><a href="#在使用antd的select中的search从远端获取数据时option渲染不符合预期行为，" class="headerlink" title="在使用antd的select中的search从远端获取数据时option渲染不符合预期行为，"></a>在使用antd的select中的search从远端获取数据时option渲染不符合预期行为，</h2><p>需求背景：下拉框列表数据默认展示二十条数据，支持后端条件过滤，在滚动时加载数据</p>
<p>场景复现：<br><video id="video" src="/images/rc-select/demo.mov" controls="" preload="none" poster="封面"></p>
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从视频中可以看到到在搜索数据时列表中有匹配的数据但是在ui上并没有过滤出来
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<p>loader，它是一个转换器，将A文件进行编译成B文件，比如：将A.less转换为A.css，单纯的文件转换过程。</p>
<p>plugin是一个扩展器，它丰富了webpack本身，针对是loader结束后，webpack打包的整个过程，它并不直接操作文件，而是基于事件机制工作，会监听webpack打包过程中的某些节点，执行广泛的任务</p>
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<p>问题背景： 递归求两数之间所有数之和</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">dfs</span>(<span class="params">n,current</span>){ </span><br><span class="line"> <span class="keyword">if</span>(n > <span class="number">0</span>){</span><br><span class="line"> <span class="comment">// current 是累加数，只要没有到最后一个就继续累加</span></span><br><span class="line"> <span class="keyword">return</span> <span class="title function_">dfs</span>(n-<span class="number">1</span>,current + n)</span><br><span class="line"> }<span class="keyword">else</span> <span class="keyword">return</span> current</span><br><span class="line">}</span><br><span class="line"><span class="keyword">function</span> <span class="title function_">test</span>(<span class="params">n1,n2</span>){</span><br><span class="line"> <span class="keyword">if</span>(n1 > n2) <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line"> <span class="comment">// 两数到阶层相减就是两数之间所有数之和</span></span><br><span class="line"> <span class="keyword">const</span> result = <span class="title function_">dfs</span>(n2,<span class="number">0</span>) - <span class="title function_">dfs</span>(n1 - <span class="number">1</span>,<span class="number">0</span>)</span><br><span class="line"> <span class="keyword">return</span> result</span><br><span class="line">}</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="title function_">test</span>(<span class="number">1</span>,<span class="number">100</span>))</span><br></pre></td></tr></table></figure>
<p>ummm 我一开始想法是分别求两个数的阶层，然后相减就是两数之间所有数之和，不过这个应该可以不用相减就可以处理的，如下</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">dfs2</span>(<span class="params">n1,n2,current</span>){</span><br><span class="line"> <span class="keyword">if</span>(n2 >= n1){</span><br><span class="line"> <span class="keyword">return</span> <span class="title function_">dfs2</span>(n1,n2 -<span class="number">1</span>,current + n2)</span><br><span class="line"> }<span class="keyword">else</span> <span class="keyword">return</span> current</span><br><span class="line">}</span><br><span class="line"><span class="keyword">function</span> <span class="title function_">test2</span>(<span class="params">n1,n2</span>){</span><br><span class="line"> <span class="keyword">return</span> <span class="title function_">dfs2</span>(n1,n2,<span class="number">0</span>)</span><br><span class="line">}</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="title function_">test2</span>(<span class="number">1</span>,<span class="number">100</span>))</span><br></pre></td></tr></table></figure>
<p>直接在计算阶层的时候处理一下累加的判断条件就行了。</p>
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<h3 id="冒泡排序"><a href="#冒泡排序" class="headerlink" title="冒泡排序"></a>冒泡排序</h3><p>每次排序找到最大的那个</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="keyword">function</span> <span class="title function_">bubble</span>(<span class="params">arr</span>){</span><br><span class="line"> <span class="keyword">let</span> swapped = <span class="literal">false</span></span><br><span class="line"> <span class="keyword">do</span>{</span><br><span class="line"> swapped = <span class="literal">false</span></span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">let</span> i =<span class="number">0</span>;i<arr.<span class="property">length</span>-<span class="number">1</span>;i++){</span><br><span class="line"> <span class="keyword">if</span>(arr[i] > arr[i+<span class="number">1</span>]){</span><br><span class="line"> [arr[i],arr[i+<span class="number">1</span>]] =[arr[i+<span class="number">1</span>],arr[i]]</span><br><span class="line"> swapped = <span class="literal">true</span>;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }<span class="keyword">while</span>(swapped)</span><br><span class="line"> <span class="keyword">return</span> arr</span><br><span class="line">}</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="title function_">bubble</span>([<span class="number">9</span>,<span class="number">6</span>,<span class="number">3</span>,<span class="number">6</span>,<span class="number">8</span>,<span class="number">0</span>,<span class="number">6</span>,<span class="number">2</span>,<span class="number">3</span>,<span class="number">5</span>]))</span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment">[</span></span><br><span class="line"><span class="comment"> 0, 2, 3, 3, 5,</span></span><br><span class="line"><span class="comment"> 6, 6, 6, 8, 9</span></span><br><span class="line"><span class="comment">]</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
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<p><code>npm i -D monaco-editor vite-plugin-monaco-editor</code> 安装依赖</p>
<p><a target="_blank" rel="noopener" href="https://github.com/vitejs/vite/discussions/1791">discussions</a></p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br></pre></td><td class="code"><pre><span class="line"><script setup lang="ts"></span><br><span class="line"></span><br><span class="line">import { onMounted, ref } from 'vue'</span><br><span class="line">import * as monaco from 'monaco-editor'</span><br><span class="line">import 'monaco-editor/esm/vs/basic-languages/css/css.contribution'</span><br><span class="line">import 'monaco-editor/esm/vs/basic-languages/xml/xml.contribution'</span><br><span class="line">import 'monaco-editor/esm/vs/basic-languages/javascript/javascript.contribution'</span><br><span class="line">//@ts-ignore</span><br><span class="line">import EditorWorker from 'monaco-editor/esm/vs/editor/editor.worker?worker'</span><br><span class="line">//@ts-ignore</span><br><span class="line"></span><br><span class="line">import TsWorker from 'monaco-editor/esm/vs/language/typescript/ts.worker?worker'</span><br><span class="line">//@ts-ignore</span><br><span class="line">import JsonWorker from 'monaco-editor/esm/vs/language/json/json.worker?worker'</span><br><span class="line">//@ts-ignore</span><br><span class="line">import CssWorker from 'monaco-editor/esm/vs/language/css/css.worker?worker'</span><br><span class="line">//@ts-ignore</span><br><span class="line">import HtmlWorker from 'monaco-editor/esm/vs/language/html/html.worker?worker'</span><br><span class="line">// @ts-ignore</span><br><span class="line">self.MonacoEnvironment = {</span><br><span class="line"> getWorker(_: string, label: string) {</span><br><span class="line"> if (label === 'typescript' || label === 'javascript') return new TsWorker()</span><br><span class="line"> if (label === 'json') return new JsonWorker()</span><br><span class="line"> if (label === 'css') return new CssWorker()</span><br><span class="line"> if (label === 'html') return new HtmlWorker()</span><br><span class="line"> return new EditorWorker()</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">const monacoRef = ref();</span><br><span class="line">const monacoInstance = ref<ReturnType<typeof monaco.editor.create>>()</span><br><span class="line">onMounted(() => {</span><br><span class="line"> monacoInstance.value = monaco.editor.create(monacoRef.value,{</span><br><span class="line"> language:"typescript",</span><br><span class="line"> value:"console.log('hello world')"</span><br><span class="line"> })</span><br><span class="line">})</span><br><span class="line"></script></span><br><span class="line"><template></span><br><span class="line"> <div id="monaco" ref="monacoRef"></div></span><br><span class="line"></template></span><br><span class="line"><style scoped></span><br><span class="line">#monaco{</span><br><span class="line"> height: 500px;</span><br><span class="line"> width: 500px;</span><br><span class="line">}</span><br><span class="line"></style></span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> { defineConfig } <span class="keyword">from</span> <span class="string">'vite'</span></span><br><span class="line"><span class="keyword">import</span> vue <span class="keyword">from</span> <span class="string">'@vitejs/plugin-vue'</span></span><br><span class="line"><span class="keyword">const</span> prefix = <span class="string">`monaco-editor/esm/vs`</span>;</span><br><span class="line"><span class="keyword">import</span> monacoEditorPlugin <span class="keyword">from</span> <span class="string">"vite-plugin-monaco-editor"</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// https://vitejs.dev/config/</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> <span class="title function_">defineConfig</span>({</span><br><span class="line"> <span class="attr">plugins</span>: [<span class="title function_">vue</span>(),<span class="title function_">monacoEditorPlugin</span>()],</span><br><span class="line"> <span class="attr">build</span>:{</span><br><span class="line"> <span class="attr">rollupOptions</span>: {</span><br><span class="line"> <span class="attr">output</span>: {</span><br><span class="line"> <span class="attr">manualChunks</span>: {</span><br><span class="line"> <span class="attr">jsonWorker</span>: [<span class="string">`<span class="subst">${prefix}</span>/language/json/json.worker`</span>],</span><br><span class="line"> <span class="attr">cssWorker</span>: [<span class="string">`<span class="subst">${prefix}</span>/language/css/css.worker`</span>],</span><br><span class="line"> <span class="attr">htmlWorker</span>: [<span class="string">`<span class="subst">${prefix}</span>/language/html/html.worker`</span>],</span><br><span class="line"> <span class="attr">tsWorker</span>: [<span class="string">`<span class="subst">${prefix}</span>/language/typescript/ts.worker`</span>],</span><br><span class="line"> <span class="attr">editorWorker</span>: [<span class="string">`<span class="subst">${prefix}</span>/editor/editor.worker`</span>],</span><br><span class="line"> },</span><br><span class="line"> },</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">})</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<p>运行结果：</p>
<p><img src="/images/monaco-editor/editor.jpg" alt="结果"></p>
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