js通过class获取元素 

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta charset="utf-8">
<title>通过class获取元素</title>
<style>
#box div { width:100px; height:100px; border:1px solid red; margin:10px; }
#box .bar { background:#ccc; }
</style>
<script>
window.onload=function (){
    var oDiv=document.getElementById('box');
    
    var arr=getByClass(oDiv, 'bar');
    
    alert(arr.length);
};

function getByClass(oParent, sClassName)
{
    var res=[];
    var aTmp=oParent.getElementsByTagName('*');
    
    for (var i=0; i<aTmp.length; i++)
    {
        if (aTmp[i].className.indexOf(sClassName) != -1)
　　　　　　
        {
            res.push(aTmp[i]);
        }
    }
    
    return res;
}

</script>
</head>

<body>
    <div id="box">
        <div class="bar item"></div>
        <div class="bar"></div>
        <div class="bar"></div>
        <div></div>
        <div></div>
        <p class="bar"></p>
    </div>
</body>
</html>

 

posted @ 2014-11-24 14:32  高尔础础  阅读(4707)  评论(0)    收藏  举报