首页 > 在aLiBig[this.index].style.zIndex=nowZindex++;不知道哪里错?

在aLiBig[this.index].style.zIndex=nowZindex++;不知道哪里错?

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<title>略图左右切换</title>
<link type="text/css" href="css/index.css"  rel="stylesheet"/>
<script src="js/startMove.js"></script>

<script>
    function GetByClass(oParent,sClass){
        var aEle=oParent.getElementsByTagName('*');
        var aResult=[];
        for(i=0;i<aEle.length;i++){
            if(aEle[i].className==sClass){
                aResult.push(aEle[i]);
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        return aResult;
        
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    window.onload=function (){
        //变量:
        var oDiv=document.getElementById('box_play');
        var oBtnPrev=GetByClass(oDiv,'prev')[0];
        var oBtnNext=GetByClass(oDiv,'next')[0];
        var oMarkLeft=GetByClass(oDiv,'mark_left')[0];
        var oMarkRight=GetByClass(oDiv,'mark_right')[0];
        
        var oDivSmall=GetByClass(oDiv,'small_pic')[0];
        var aLiSmall=oDivSmall.getElementsByTagName('li');
        
        var oUlBig=GetByClass(oDiv,'ul_pic')[0];
        var aLiBig=oUlBig.getElementsByTagName('li');
        
        
        
        var nowZindex=2;
        //鼠标移出移入:
        oBtnPrev.onmouseover=function (){
            move(oMarkLeft,'opacity',100);
            
        };
        
        oBtnPrev.onmouseout=function (){
            move(oMarkLeft,'opacity',0);
            
        };
        
        oBtnNext.onmouseover=function (){
            move(oMarkRight,'opacity',100);
            
        };
        
        oBtnNext.onmouseout=function (){
            move(oMarkRight,'opacity',0);
            
        };
         
         //大图切换:
         for(i=0;i<aLiSmall.length;i++){
             aLiSmall.index=i;
             aLiSmall[i].onclick=function (){
                 aLiBig[this.index].style.zIndex=nowZindex++;
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            <ul class="ul_pic">
                <li style="z-index: 1;"><a href="#"><img src="images/1.jpg" ></a><span class="sp_left">周星驰拍《西游·降魔篇》时,半夜会来吃饭,点一份干炒牛河。</span><span class="sp_right">1/10</span></li>
                <li><a href="#"><img src="images/2.jpg" ></a><span class="sp_left">周星驰拍《西游·降魔篇》时,半夜会来吃饭,点一份干炒牛河。</span><span class="sp_right">2/10</span></li>
                <li><a href="#"><img src="images/3.jpg" ></a><span class="sp_left">周星驰拍《西游·降魔篇》时,半夜会来吃饭,点一份干炒牛河。</span><span class="sp_right">3/10</span></li>
                <li><a href="#"><img src="images/4.jpg" ></a><span class="sp_left">周星驰拍《西游·降魔篇》时,半夜会来吃饭,点一份干炒牛河。</span><span class="sp_right">4/10</span></li>
                <li><a href="#"><img src="images/5.jpg" ></a><span class="sp_left">周星驰拍《西游·降魔篇》时,半夜会来吃饭,点一份干炒牛河。</span><span class="sp_right">5/10</span></li>
                <li><a href="#"><img src="images/6.jpg" ></a><span class="sp_left">周星驰拍《西游·降魔篇》时,半夜会来吃饭,点一份干炒牛河。</span><span class="sp_right">6/10</span></li>
                <li><a href="#"><img src="images/7.jpg" ></a><span class="sp_left">周星驰拍《西游·降魔篇》时,半夜会来吃饭,点一份干炒牛河。</span><span class="sp_right">7/10</span></li>
                <li><a href="#"><img src="images/8.jpg" ></a><span class="sp_left">周星驰拍《西游·降魔篇》时,半夜会来吃饭,点一份干炒牛河。</span><span class="sp_right">8/10</span></li>
                <li><a href="#"><img src="images/9.jpg" ></a><span class="sp_left">周星驰拍《西游·降魔篇》时,半夜会来吃饭,点一份干炒牛河。</span><span class="sp_right">9/10</span></li>
                <li><a href="#"><img src="images/10.jpg" ></a><span class="sp_left">周星驰拍《西游·降魔篇》时,半夜会来吃饭,点一份干炒牛河。</span><span class="sp_right">10/10</span></li>            
            </ul>
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        <div class="small_pic">
            <ul>
                <li><a href="#"><img src="images/1.jpg" ></a></li>
                <li><a href="#"><img src="images/2.jpg" ></a></li>
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                <li><a href="#"><img src="images/4.jpg" ></a></li>
                <li><a href="#"><img src="images/5.jpg" ></a></li>
                <li><a href="#"><img src="images/6.jpg" ></a></li>
                <li><a href="#"><img src="images/7.jpg" ></a></li>
                <li><a href="#"><img src="images/8.jpg" ></a></li>
                <li><a href="#"><img src="images/9.jpg" ></a></li>
                <li><a href="#"><img src="images/10.jpg" ></a></li>
            </ul>
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