为什么会出现这样的问题？
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
body{margin: 0;padding: 0;}
#div1{width:560px;height:660px;background-color:#0C4E7C;position:fixed;left:-560px;}
span{width:20px;height:50px;background-color:#FFA500;position:absolute;left:560px;border: 5px dotted #8B0000;}
#div2{width: 200px;height: 200px;background-color: #8B0000;opacity:0.3;margin-left:30px;}
</style>
<script type="text/javascript">
window.onload=function(){
var div=document.getElementById("div1"); //var stl=window.getComputedStyle(div,null);
var div1=document.getElementById("div2"); //div.style.top=(document.documentElement.clientHeight/2)-parseInt(stl.height)/2+"px";
//透明变化
div1.onmouseover=function(){
stars(100);
}
div1.onmouseout=function(){
stars(30);
}
//伸缩运动
div.onmouseover=function(){
starMove(0);
}
div.onmouseout=function(){
starMove(-560);
}
}
//2-1&3-1
var timer=null;
function starMove(sp){
clearInterval(timer);
var div=document.getElementById("div1");
timer=setInterval(function(){
var speed=0;
if(div.offsetLeft<sp){speed=6;}
else{speed=-6;}
if(div.offsetLeft==sp){
clearInterval(timer);
}
else{
if(div.offsetLeft>-560/2){speed=speed*3;}else{speed=speed;}
div.style.left=div.offsetLeft+speed+"px";
//解决抖动
if(div.offsetLeft>0){clearInterval(timer);div.style.left="0px";}
if(div.offsetLeft<-560){clearInterval(timer);div.style.left="-560px";}
}
},26)
}
//2-2
var tiimer=null;
var aph=30;
function stars(isp){
var div1=document.getElementById("div2");
clearInterval(tiimer);
tiimer=setInterval(function(){
var speed=0;
if(aph>isp){speed=-10;}else{speed=10;}
if(aph==isp){clearInterval(tiimer);}
else{
aph+=speed;
div1.style.opacity=aph/100;}
},30)
}
</script>
</head>
<body>
<div id="div1">
<span>分享</span>
</div>
<div id="div2">
</div>
</body>
</html>为什么这个蓝色的DIV会被透明化？我没给他设置透明啊。
http://www.imooc.com/video/2880
