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请教一下，以下是轮播图的代码，我想 在 startMove(aLiUl[this.go],{opacity:100});这一行进行debug。于是我在上面点了bug,但是不知道为什么进不去。我这个是在一个html页面打了个断点
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title></title>
<style>
body,ul,ol{margin:0;padding:0;}
li{ list-style:none;}
img{ border:none; vertical-align:top; }
#box{width:470px;height:150px; position:relative; margin:30px auto; overflow:hidden;}
ul{ width:470px; position:absolute;left:0; top:0; z-index:1;}
ul li{width:470px; display:block;}
ol{z-index:2; width:120px; position:absolute;right:10px; bottom:10px;}
ol li{ width:20px;height:20px; float:left;margin:0 2px;
display:inline; background:#fff; color:#f60; line-height:20px; text-align:center;}
ol .active{ background:#f60; color:#fff;}
</style>
<script >
function startMove(obj,json,endFn){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var bBtn = true;
for(var attr in json){
var iCur = 0;
if(attr == 'opacity'){
if(Math.round(parseFloat(getStyle(obj,attr))*100)==0){
iCur = Math.round(parseFloat(getStyle(obj,attr))*100);
}
else{
iCur = Math.round(parseFloat(getStyle(obj,attr))*100) || 100;
}
}
else{
iCur = parseInt(getStyle(obj,attr)) || 0;
}
var iSpeed = (json[attr] - iCur)/8;
iSpeed = iSpeed >0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
if(iCur!=json[attr]){
bBtn = false;
}
if(attr == 'opacity'){
obj.style.filter = 'alpha(opacity=' +(iCur + iSpeed)+ ')';
obj.style.opacity = (iCur + iSpeed)/100;
}
else{
obj.style[attr] = iCur + iSpeed + 'px';
}
}
if(bBtn){
clearInterval(obj.timer);
if(endFn){
endFn.call(obj);
}
}
},30);
}
//aLiUl[this.go] obj attr (attr == 'opacity'
function getStyle(obj,attr){
if(obj.currentStyle){
return obj.currentStyle[attr];
}
else{
return getComputedStyle(obj,false)[attr];
}
}
</script>
<script>
window.onload = function(){
var oUl = document.getElementsByTagName('ul')[0];
var aLiUl = oUl.getElementsByTagName('li');
var oOl = document.getElementsByTagName('ol')[0];
var aLiOl = oOl.getElementsByTagName('li');
for(var i=0;i<aLiOl.length;i++){
aLiOl[i].go = i;
console.log(aLiOl[0].className);
aLiOl[i].onmouseover = function(){
for(var i=0;i<aLiOl.length;i++){
aLiOl[i].className = '';
aLiUl[i].style.display = 'none';
aLiUl[i].style.filter = 'alpha(opacity=0)';
aLiUl[i].style.opacity = 0;
}
this.className = 'active';
aLiUl[this.go].style.display = 'block';
startMove(aLiUl[this.go],{opacity:100});
};
}
};
</script>
</head>
<body>
<div id="box">
<ul>
<li style="display:block"><img src="images/1.jpg" alt=""/></li>
<li><img src="images/2.jpg" alt=""/></li>
<li><img src="images/3.jpg" alt=""/></li>
<li><img src="images/4.jpg" alt=""/></li>
<li><img src="images/5.jpg" alt=""/></li>
</ul>
<ol>
<li class="active">1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
</ol>
</div>
</body>
</html>
需要在chrome 的devtool 里打开 Sources 面板，在js 源代码上打断点
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