<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>多物体运动</title>
<style type="text/css">
*{
padding: 0;
margin: 0;
}
ul,li {
list-style: none;
}
ul li {
width: 200px;
height: 100px;
background: yellow;
margin-bottom: 20px;
}
</style>
<script type="text/javascript">
window.onload=function(){
var aLi=document.getElementsByTagName('li');
for(var i=0;i>aLi.length;i++){
aLi[i].timer=null
aLi[i].onmouseover=function(){
startMove(this,400);
}
aLi[i].onmouseout=function(){
startMove(this,200);
}
}
}
//var timer=null;
function startMove(obj,iTarget){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
var speed=(iTarget-obj.offsetWidth)/8;
speed=speed >0?Math.ceil(speed):Math.floor(speed);
if(obj.offsetWidth==iTarget){
clearInterval(obj.timer);
}else{
obj.style.width=obj.offsetWidth+speed+'px';
}
},30)
}
</script>
</head>
<body>
<ul>
<li></li>
<li></li>
<li></li>
</ul>
</body>
</html>程序的第24行
应该是小于号
for(var i=0;i<aLi.length;i++){