怎么还不行，大神告诉我
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jQuery动画特效</title>
</head>
<body>
<style>
div{
position:absolute;
top:50px;
left:200px;
height:50px;
width:50px;
border:1px solid red;
}
</style>
<div></div>
<input type="button" value="left" id="l">
<input type="button" value="right" id="r">
<script type="text/javascript">
$(function(){
$("#l").bind("click",
function(){
$("div").animate({
left:"+=50px"
},3000)
})
$("#r").bind("click",function(){
$("div").animate({left:"+=50px"},3000)
})
})
</script>
</body>
</html>
为毛不行啊
