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                        /jQuery基础课程

代码没有错误却执行不了。。。怎么回事？？

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>jQuery动画特效</title>
        <script src="http://libs.baidu.com/jquery/1.9.0/jquery.js" type="text/javascript"></script>
        <style type="text/css">
            div{
                width:50px;
                height:50px;
                background-color:red;
                position:absolute;
                left:100px;
                }
        </style>
    </head>
    
    <body>
        <input id="left" value="左移" type="button"/>
        <input id="right" value="右移" type="button"/>
        <div></div>
        <script type="text/javascript">
            $(function(){
                $("#left").bind("click",function(){
                    $("div").animate({
                        left:"-=50px";
                    },2000)
                });
               $("#right").bind("click",function(){
                    $("div").animate({
                        left:"+=50px";
                    },3000)
                }); 
            })
        </script>
    </body>
</html>
执行不了，代码没错，也引用了库，怎么回事？？