[Js]封装好的通过className来获取元素的函数

<div id="box">

<div class="star"></div>

<div class="star"></div>

<div class="app"></div>

<p class="star"></p>

<p class="ar"></p>

</div>

假设要获取所有.star元素

function getByClass(oparent,sClass){

var aEle=oparent.getElementsByTagName("*");

var aResult=[];

var i;

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

if(aEle[i].className==sClass){

aResult.push(aEle[i]);

}

}

return aResult;

};

window.onload=function(){

var box=document.getElementById("box");

var star=getByClass(box,"star");

};