一个广告图片轮换问题

Question

<div class="fan">
                                <div class="container" id="idTransformView2">
                                    <ul class="slider slider2" id="idSlider2">
                                        <li>
                                            <img src="Skin/temp/tu_2.jpg" /></li>
                                        <li>
                                            <img src="Skin/temp/tu_2.jpg" /></li>
                                        <li>
                                            <img src="Skin/temp/tu_2.jpg" /></li>
                                        <li>
                                            <img src="Skin/temp/tu_2.jpg" /></li>
                                        <li>
                                            <img src="Skin/temp/tu_2.jpg" /></li>
                                    </ul>
                                    <ul class="num" id="idNum2">
                                        <li>1</li>
                                        <li>2</li>
                                        <li>3</li>
                                        <li>4</li>
                                        <li>5</li>
                                    </ul>
                                </div>
                            </div>$(function(){
    var len2 = $("#idNum2 > li").length;
    alert(len2);
    var index2 = 0;
    showImg2(index2);
    $("#idNum2 li").mouseover(function(){
       index2 =   $("#idNum2 li").index(this);
       showImg2(index2);
    });
    //滑入 停止动画，滑出开始动画.
    $('#idTransformView2').hover(function(){
         if(MyTime2){
            clearInterval(MyTime2);
         }
    },function(){
         MyTime2 = setInterval(function(){
            showImg2(index2);
            index2++;
            if(index2==len2){index2=0;}
        } , 3000);
    });
    //自动开始
    var MyTime2 = setInterval(function(){
       showImg2(index2);
       index2++;
       if(index2==len2){index2=0;}
    } , 3000);
})
// Demo2 : 关键函数：通过控制left ，来显示不通的幻灯片
function showImg2(i){
   $("#idSlider2").stop(true,false).animate({left : -422*i},800);
   $("#idNum2 li")
    .eq(i).addClass("on")
    .siblings().removeClass("on");
}为什么走到第五章图片的时候是空白呢？？？

Answer 1

多个地方都是那样。
应该是多算了一个。注意序号从0开始还是从1开始，你自己进行分析