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为什么我写了多个方法反而不行。，

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>toggle()方法绑定多个函数</title>
        <script src="http://libs.baidu.com/jquery/1.8.2/jquery.js" type="text/javascript"></script>
        <link href="style.css" rel="stylesheet" type="text/css" />
    </head>
    <body>
        <h3>toggle()方法绑定多个函数</h3>
        <input id="btntest" type="button" value="点一下我" />
        <div>我是动态显示的</div>
        
        <script type="text/javascript">
            $(function () {
                $("#btntest").bind("click", function () {
                    $("div").toggle(
                        function(){
                            $(this).attr("display","none");
                        },
                        function(){
                            $(this).removeAttr("display");
                        }
                        );
                     
                })
            });
        </script>
    </body>
</html>