【DOM编程艺术】getElementsByClassName

<div id=‘shop‘>

    <div class=‘a1 a2‘>111</div>

    <div class=‘a1 a3‘>222</div>

    <div class=‘a2 a3‘>333</div>

</div>

<script type="text/javascript">

function getElementsByClassName(node,classname){

    if(node.getElementsByClassName){

        return node.getElementsByClassName(classname);

    }else{

        var elem = node.getElementsByTagName(‘*‘);

        var result=[];

        for(var i =0; i<elem.length;i++){

            if(elem[i].className.indexOf(classname) != -1){

                result[result.length]=elem[i];

            }

        }

        return result;

    }

}

var shoping = document.getElementById(‘shop‘);

var thing = getElementsByClassName(shoping,‘a1‘);

console.log(thing);

</script>

【DOM编程艺术】getElementsByClassName