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ct3.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>随机小学数学题</title>
<style type="text/css">
*{
font-family: "微软雅黑";
font-size: 20px;
border-collapse: collapse;
}
#title,.p_title{
text-align: center;
font-size: 30px;
font-weight: 900;
}
#title{
height: 120px;
line-height: 120px;
}
.p_title{
clear: both;
height: 140px;
line-height: 140px;
display: none;
}
#choose{
text-align: center;
}
#out{
width: 880px;
margin: 20px auto;
padding: 20px;
}
#content{
/*height: 1000px;*/
float: left;
border: 1px black solid;
}
.question{
width: 420px;
height: 47px;
float: left;
}
.question .subject{
display: inline-block;
}
.question .result{
text-align: center;
border: 0px;
border-bottom: 1px black solid;
}
.a,.b,.c,.answer{
display: inline-block;
width: 60px;
text-align: center;
}
.op,.op2{
display: inline-block;
width: 22px;
text-align: center;
}
.answer{
color: green;
/*font-style: italic;*/
font-weight: 900;
}
.hidden{
display: none;
}
.show{
display: inline-block;
}
.seq{
display: none;
font-style: italic;
width: 30px;
}
</style>
</head>
<body>
<div id="">
<div id="title">
小学数学练习题
</div>
<div id="top">
<div id="choose">
<form action="" method="post" onsubmit="return false;" name="ckop">
选择符号：
<input type="checkbox" name="op" id="jia" value="+" checked/><label for="jia">加</label> 
<input type="checkbox" name="op" id="jian" value="-"/><label for="jian">减</label> 
<input type="checkbox" name="op" id="cheng" value="*"/><label for="cheng">乘</label> 
<input type="checkbox" name="op" id="chu" value="/"/><label for="chu">除</label> 
<br /><br />
输入范围：
<input type="text" value="0" size="8" id="minNum"/> 到 <input type="text" value="100" size="8" id="maxNum"/>
<br /><br />
数量：<input type="text" id="q_num" value="50" />
是否显示编号：<input type="checkbox" id="s_seq" onchange="show_seq(this);" />
<br /><br />
<input type="button" value="出题" onclick="work();"/>
<input type="button" value="显示答案" id="show_an" onclick="show_answer(this);" />
<input type="button" value="判题" id="check_an" onclick="check_answer(this);" />
<input type="button" value="打印" onclick="print_q();" />
<input type="button" value="隐藏横线打印" onclick="show_line(this);" />
<br /><br />
<div>注：可以先点击 "显示答案" 再后再选择 "隐藏横线打印" 打印答案</div>
<div id="show_msg"></div>
</form>
</div>
</div>
<div id="out">
<div id="content" >
<!--<div class="question">
<span class="seq">1、 </span>
<span class="subject">
<span class="a">1</span>
<span>+</span>
<span class="b">1</span>
<span>+</span>
<span class="c">1</span>
=<input type="text" size="6" class="result" />
</span>
<span class="answer">2</span>
<span class="tip">√</span>
</div>-->
</div>
</div>
</div>
</body>
<script type="text/javascript">
var op=[];// 运算符数组
var minNum,maxNum,a,b,total=0;// 获取最小值，最大值，随机数a，数b;总题数
var title = "";
// 获取参数
function getOp () {
// 获取选中的运算符
op=[];
ops = document.getElementsByName("op");
for (var i = 0; i < ops.length; i++) {
if(ops[i].checked){
op.push(ops[i].value);
}
}
// 获取数
minNum = parseInt(document.getElementById("minNum").value);
maxNum = parseInt(document.getElementById("maxNum").value);
total = document.getElementById("q_num").value;
if(isNaN(minNum) || isNaN(maxNum)){
alert("请输入正确的数字！");
return false;
}
title = "小学数学【";
for (var i = 0; i < op.length; i++) {
switch (op[i]){
case '+':title += "加、";break;
case '-':title += "减、";break;
case '*':title += "乘、";break;
case '/':title += "除、";break;
default:
break;
}
}
title = title.substr(0,title.length-1);
title+="】练习题";
document.getElementById("title").innerHTML = title;
return true;
}
// 出题按钮
function work () {
document.getElementById("content").innerHTML = "";
document.getElementById("check_an").value ="判题";
document.getElementById("show_an").value = "显示答案";
document.getElementById("s_seq").checked = false;
if(!getOp()){ return; }
for (var i = 1; i <= total; i++) {
getQuerstin(i);
}
}
// 出题并显示
function getQuerstin (seq) {
a = Math.floor(Math.random()*(maxNum-minNum+1)+minNum);
b = Math.floor(Math.random()*(maxNum-minNum+1)+minNum);
c = Math.floor(Math.random()*(maxNum-minNum+1)+minNum);
o = op[Math.floor(Math.random()*op.length)];
o2 = op[Math.floor(Math.random()*op.length)];
// 除数不能为0，并且a/b能整除，b为a的约数
if(o=='/'){ //
if(b==0){b= Math.floor(Math.random()*(maxNum)+1);}
if(a!=0){
// a = Math.floor(Math.random()*(maxNum)+1);// 让被除数不为0
b = getChuShu(a);// 除法运算，除数为被除数的约数
}
}
if(o2 == '/'){
// 除数C不能为0
if(c==0){
c = Math.floor(Math.random()*(maxNum)+1);// 让除数不为0
}
// b/c能整除
if(o == "+" || o=="-"){
if(b!=0){
//b = Math.floor(Math.random()*(maxNum)+1);// 让被除数不为0
c = getChuShu(b);// 除法运算，除数为被除数的约数
}
}
else if(o=="*" || o== "/"){
var temp = eval(a+o+b);
if(temp != "0"){
c = getChuShu(temp);// 除法运算，除数为被除数的约数
}
}
}
// 答案：
var answer = eval(a+o+b+o2+c);
// 乘号: × × 除法: ÷ ÷ − -
var str = o.replace("*","×").replace("/","÷");
var op2 = o2.replace("*","×").replace("/","÷");
var txt = "<div class='question'><span class='seq'>"+seq+"、 </span><span class='subject'><span class='a'>"+a+"</span><span class='op'>"+str+"</span><span class='b'>"+b+"</span><span class='op2'>"+op2+"</span><span class='c'>"+c+"</span>= <input type='text' size='6' class='result' /></span><span class='answer hidden'>"+answer+"</span><span class='tip'></span></div>"
var content = document.getElementById("content");
content.innerHTML = content.innerHTML + txt;
if(seq%50==0 && seq <total){
// txt += "<div style='clear: both;height: 70px;'></div>";
content.innerHTML = content.innerHTML + "<div class='p_title'>"+title+"</div>";
}
}
// 根据被除数，随机除数
function getChuShu (n) {
var yueshu = [];// 约数
for(var i=1;i<=n;i++){
if(n%i==0){yueshu.push(i)}
}
if(yueshu.length>2){ // 如果约数除了1和本身，就排除1和本身
return yueshu[Math.floor(Math.random()*(yueshu.length-2)+1)];
}
return yueshu[Math.floor(Math.random()*yueshu.length)];
}
// 显示隐藏答案
function show_answer (ts) {
var flag = false;
if(ts.value == "显示答案"){
flag= true;
ts.value = "隐藏答案";
}else{
flag = false;
ts.value = "显示答案"
}
var answers = document.getElementsByClassName("answer");
for (var i = 0; i < answers.length; i++) {
if(flag) answers[i].className = "answer";
else answers[i].className = "answer hidden";
}
}
// 判题
function check_answer (ts) {
var flag = false;
var count_true = 0,count_false = 0;
if(ts.value == "判题"){
flag= true;
ts.value = "取消判题";
}else{
flag = false;
ts.value = "判题";
}
var answers = document.getElementsByClassName("answer");
var results = document.getElementsByClassName("result");
var tips = document.getElementsByClassName("tip");
if(!flag){// 取消判题
for (var i = 0; i < tips.length; i++) {
tips[i].innerHTML ="";
}
document.getElementById("show_msg").innerHTML ="";
return;
}
for (var i = 0; i < results.length; i++) {
if(results[i].value == answers[i].innerText){
tips[i].innerHTML = "<span style='color: green;'> √ </span>";count_true++;
}else{
tips[i].innerHTML = "<span style='color: red;'> x </span>";count_false++;
}
}
document.getElementById("show_msg").innerHTML = "总题数：" + total + "  对："+count_true +"  错："+count_false+"  正确率："+isFloat(count_true/total)*100 +"%";
}
// 打印
function print_q () {
var top = document.getElementById("top");
top.style.display="none";
var p_titles = document.getElementsByClassName("p_title");
for (var i = 0; i < p_titles.length; i++) {
p_titles[i].style.display = "block";
}
document.getElementById("content").style.border = "0";
window.print();
top.style.display="block";
for (var i = 0; i < p_titles.length; i++) {
p_titles[i].style.display = "none";
}
document.getElementById("content").style.border = "1px black solid";
}
function show_line (ts) {
var results = document.getElementsByClassName("result");
for (var i = 0; i < results.length; i++) {
results[i].style.display = "none";
}
print_q ();
for (var i = 0; i < results.length; i++) {
results[i].style.display = "inline-block";
}
}
function show_seq (ts) {
var seqs = document.getElementsByClassName("seq");
for (var i = 0; i < seqs.length; i++) {
if(ts.checked){
seqs[i].style.display = "inline-block";
}else{
seqs[i].style.display = "none";
}
}
}
// 小数取两位小数
function isFloat (n) {
if(parseInt(n) < parseFloat(n)) {
n = n.toFixed(2);
}
return n;
}
</script>
</html>