<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>封装Class类</title>
<!-- 主要为了解决IE8以下浏览器不支持document.getElementsByClassName()；(通过类名访问节点) 的问题； -->
<style type="text/css">
div{background-color: pink;margin-top: 20px;width: 300px; height: 100px;}
</style>
<script type="text/javascript">
window.onload=function(){
function fn(classname){
if(document.getElementsByClassName){
// alert("该浏览器支持getElementsByClassName");
return document.getElementsByClassName(classname);
}else{
var arr=[];
var divs=document.getElementsByTagName("*");//获取所有的div标签
for(var i=0;i<divs.length;i++){//遍历,挑出所有满足情况的div
if(divs[i].className==classname){
arr.push(divs[i]);
}
}
return arr;
}
}
//ie中输出：哈哈 3
//ie中输出：undefined 3
alert(fn("demo")[1].value);
alert(fn("demo").length);
}
</script>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div class="demo" value="哈">123</div>
<div></div>
<div></div>
<div class="demo" value="哈哈">456</div>
<div></div>
<div></div>
<div></div>
<div class="demo">789</div>
</body>
</html>
