                        課程
                    
                        /前端開發
                        
                            /JavaScript
                        
                        /JS動畫效果

為什么我的代碼就是實現不了多物體運動？請大神看看。

<!doctype html>
<html>
<head>
??? <meta charset="UTF-8">
?? ?<title>Document</title>
<style type="text/css">
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].onmouseover=function(){
??????? startMove(this,400);

?????? }

?????? Ali[i].onmouseout=function(){
????? ??? ?startMove(this,200);
?????? }
??? }

?? ?}

var timer=null;
function startMove(obj,iTarget){
clearInterval(timer);
timer=setInterval(function(){
??? var speed=(iTarget-obj.offsetwidth)/8;
??? speed=speed>0?Math.ceil(speed):Math.floor(speed);
??? if(obj.offsetwidth=iTarget){
???? clearInterval(timer);

??? }
??? else{
?? ??? ?obj.style.width=obj.offsetwidth+speed+'px';
??? }

},30)

}

</script>

</head>

<body>
?? ?<ul>
?? ??? ?<li></li>
?? ??? ?<li></li>
?? ??? ?<li></li>

?? ?</ul>
</body>
</html>