<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div class="div1"></div>
<div class="div1"></div>
<div class="div1"></div>
<div></div>
</body>
</html>
<script>
function getElesByClassName(className){
if(document.getElementsByClassName(className)){ //如果浏览器支持document.getElementsByClassName()方法
return document.getElementsByClassName(className);
}else{
var all=document.getElementsByTagName("*");
var arr=[];
for(var i=0;i<all.length;i++){
if(all[i].className==className){
arr.push(all[i]);
}
}
return arr;
}
}
var eles =getElesByClassName("div1");
alert(eles.length);
</script>
