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                                <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title></title>
            <style type="text/css">
                *{
                    padding: 0;
                    margin: 0;
                }
                img{
                    display: block;
                    margin: 0 auto;
                }
                .menu.f{
                    position: fixed;
                    left: 50%;
                    top: 0;
                    margin-left: -480px;
                }
            </style>
        </head>
        <body>
            <img src="images/1.jpg" alt="" />
            <img src="images/2.jpg" class="menu" />
            <img src="images/3.jpg" alt="" />
        <script src="jquery-1.11.3.min.js" type="text/javascript" charset="utf-8"></script>
        <script type="text/javascript">
            $(window).scroll(function(){
                //獲得滾動上去的距離
                var st = $(document).scrollTop();
                document.title = st;
                if (st>238) {
                    //$(".menu").css({
                    //'position':'fixed',
                    //'top':'0',
                    //'left':'50%',
                    //'margin-left':'-480px',
                    //})
                    $(".menu").addClass('f');
                }else{
                    $(".menu").removeClass('f');
                }
            })
        </script>
        </body>
    </html>

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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