<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{ margin: 0; padding:0;}
div{ margin: 10px; float: left; width: 200px; height: 200px; background-color: red; filter: alpha(opacity:30); opacity: 0.3;}
</style>
<script>
window.onload=function() {
var oDiv=document.getElementsByTagName("div");
for(var i=0;i<oDiv.legth;i++){
oDiv[i].alpha=30; //多物体运动时，清除定时器(每一个都定义就不会争)
oDiv[i].onmouseover=function(){
startMove(this,100);
}
oDiv[i].onmouseout=function(){
startMove(this,30);
}
}
}
//var timer=null;
//var alpha=30; //定义一个变量
function startMove(obj,iTarget){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
var speed=0;
if(obj.alpha>iTarget){
speed=-10;
}else{
speed=10;
}
if(obj.alpha==iTarget){
clearInterval(obj.timer);
}else{
obj.alpha+=speed;
obj.style.filter='alpha(opacity:'+obj.alpha+')';
obj.style.opacity=obj.alpha/100;
}
},30)
}
</script>
</head>
<body>
<div id="div1"></div>
<div id="div2"></div>
<div id="div3"></div>
<div id="div4"></div>
</body>
</html>
李晓健
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