<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>body,div,ul,li{
margin:0;
padding: 0;
font-family: Arial;
font-size:12px;
}
ul li{
list-style:none;
}
#tab{
position:absolute;
top:50%;
left:50%;
padding:10px;
margin-left:-460px;
margin-top:-145px;
width:900px;
height:270px;
border:1px solid red;
border-radius:10px;
}
#tab li{
height:30px;
line-height: 30px;
}
#tab li span{
width:100px;
height:30px;
text-align:center;
display: inline-block;
}</style>
</head>
<body>
<div id='tab'>
<ul>
</ul>
</div>
<script type='text/javascript'>var oTab = document.getElementById('tab');var str = '';
str+="<ul>"for(var i = 1;i<=9;i++){var val = "c1";switch(i%3){case 0:
val = "c1";break;case 1:
val = "c2";break;default:
val = "c3";
}
str+="<li class='"+val+"'>";for(var j = 1;j<=i;j++){
str+="<span>";
str+=""+j+"*"+i+" = "+(j*i)+""str+="</span>"}
str+="</li>"}
str+="</ul>"oTab.innerHTML = str;//字符串拼接的第一条黄金法则：单双不能同时用。必须间隔出现//如果一个字符串中需要增加一个变量，看最外面是""还是'',如果是""，那么直接的"+变量+"。如果是单引号'',那么直接的'"+变量+"'</script>
</body>
</html>
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