重写getElementsByClassName函数
由于IE6/7/8不支持getElementByClassName方法，所以编写一个兼容的新函数如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<div id="example">
<p id="p1" class="aaa bbb">1</p>
<p id="p1" class="aaa ccc">2</p>
<p id="p1" class="ccc bbb">3</p>
</div>
<script type="text/javascript">
function getElementsByClassName(element,names){
if(element.getElementsByClassName){
return element.getElementsByClassName;
}else{
var elements = element.getElementsByTagName("*");
var result=new Array();
var classNames_str,flag;
var name=names.split(" ");
for(var i=0;i<elements.length;i++){
if(!elements[i].className)continue;
classNames_str=""+elements[i].className;
flag=true;
for(var j=0;j<name.length;j++){
if(classNames_str.indexOf(name[j])==-1){
flag=false;
break;
}
}
if(flag==true) result.push(elements[i]);
}
//alert(result.length);
return result;
}
}
var a=document.getElementById("example");
window.onload=getElementsByClassName(a,"aaa bbb");
</script>
</body>
</html>
此函数实现了
- getElementsByClassName(example, “aaa”); 运行结果为包含id为p1, id为p2的元素列表
- getElementsByClassName(example, “bbb ccc”);运行结果为包含id为p3的元素列表
- getElementsByClassName(example, “ccc bbb”);运行结果为包含id为p3的元素列表
