运行不粗来？？
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jQuery动画特效</title>
<style type="text/css">
div{
width:100px;
height:100px;
border:red solid 2px;
background-color:green;
position:absolute;
margin:10px 200px;
}
</style>
</head>
<body>
<div id="box"></div>
<input type="button" id="zuo" value="左移"/>
<input type="button" id="you" value="右移"/>
<script type="text/javascript" src="http://libs.baidu.com/jquery/1.9.0/jquery.js">
$(function(){
$("#zuo").bind("click",function(){
$("#box").animate( {left: "+=100px"},2000)
})
$("#you").bind("click",function(){
$("#box").animate( {left: "-=100px"},2000)
})
})
</script>
</body>
</html>
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我的代码，怎么没效果呢？
