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html+js 编写程序在页面上完成产生100道两位数字的加减运算题，并统计正确率
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>实验一</title>
<style type="text/css">
.left{margin-left:3cm; margin-right:3cm; color:#000}
body{background-color:#0F0}
</style>
</head>
<body>
<div class="left">
<div style="height:4cm">
<h1 align="center">100道两位数字的加减运算</h1>
<center>
<button name="提交" style="background-color:#F9F" id="b1" onClick=work()>提交</button>
</center>
</div>
<div align="center">
<from name="f1">
<script>
var a=new Array();
var b=new Array();
function work()
{
var s="",i,sum=0,ss;
for(i=0;i<100;i++)
{
s="t"+i;
ss=document.getElementById(s);
if((i+1)%4==0||(i+1)%4==3)
{
if(a[i]-b[i]==parseInt(ss.value))
sum++;
}
else
{
if(a[i]+b[i]==parseInt(ss.value))
sum++;
}
}
alert("正确率为"+sum+"%");
}
var i,j;
for(i=0;i<100;i++)
{
do{
a[i]=Math.round(Math.random()*100);
}while(a[i]<10||a[i]>99);
do{
b[i]=Math.round(Math.random()*100);
}while(b[i]<10||b[i]>99);
j=i+1;
if(j%4==0||j%4==3)
document.write(a[i]+"-"+b[i]+"=");
else
document.write(a[i]+"+"+b[i]+"=");
document.write("<input type=text id=t"+i+" value='' >"+" ");
if(j%4==0)
document.write("<br>");
}
</script>
</from>
</div>
</div>
</body>
<html>
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