getElementById怎样获取相同id

JScript code

function getByClass(oParent, sClass){    var aEle=oParent.getElementsByTagName('*');    var aResult=[];    var i=0;        for(i=0;i<aEle.length;i++)    {        if(aEle[i].className==sClass)        {            aResult.push(aEle[i]);        }    }        return aResult;}window.onload=function (){    var oDiv=document.getElementById('div1');    var aLi=getByClass(oDiv, 'miaov_box_head')[0].getElementsByTagName('li');    var aBtn=getByClass(oDiv, 'miaov_box_foot')[0].getElementsByTagName('a');    var oCaret=getByClass(oDiv, 'caret')[0];    var aPos=[];    var timer=null;    var i=0;        for(i=0;i<aLi.length;i++)    {        aLi[i].index=i;        aPos[i]=aLi[i].offsetLeft;    }        for(i=0;i<aLi.length;i++)    {        aLi[i].style.position='absolute';        aLi[i].style.left=aPos[i]+'px';    }        aBtn[0].onclick=function ()    {        var i=aLi.length-1;                clearTimeout(timer);                function next()        {            var obj=aLi[i];            if(i>=aLi.length/2)            {                miaovStartMove(aLi[i], {left: 900}, MIAOV_MOVE_TYPE.FLEX);                timer=setTimeout(next, 100);                i--;            }            else            {                timer=setTimeout(next2, 150);            }        }                function next2()        {            if(i>=0)            {                miaovStartMove(aLi[i], {left: aPos[i]}, MIAOV_MOVE_TYPE.FLEX);                timer=setTimeout(next2, 100);            }            i--;        }                next();                aBtn[1].className='';        this.className='show';        miaovStartMove(oCaret, {left: this.offsetLeft+this.offsetWidth/2}, MIAOV_MOVE_TYPE.BUFFER);    };        aBtn[1].onclick=function ()    {        var i=0;                clearTimeout(timer);                function next()        {            var obj=aLi[i];            if(i<aLi.length/2)            {                miaovStartMove(aLi[i], {left: -200}, MIAOV_MOVE_TYPE.FLEX);                timer=setTimeout(next, 100);                i++;            }            else if(i==aLi.length/2)            {                timer=setTimeout(next2, 150);            }        }                function next2()        {            if(i<aLi.length)            {                miaovStartMove(aLi[i], {left: aPos[i-aLi.length/2]}, MIAOV_MOVE_TYPE.FLEX);                timer=setTimeout(next2, 100);            }            i++;        }                next();                aBtn[0].className='';        this.className='show';        miaovStartMove(oCaret, {left: this.offsetLeft+this.offsetWidth/2}, MIAOV_MOVE_TYPE.BUFFER);    };};

为什么只能运行一个div1

[解决办法]
getElementsByTagName返回的是一个集合！你自己再遍历就可以找到了。