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                            ~~~
//當滾動條的位置處于距頂部100像素以下時，跳轉鏈接出現，否則消失
$(function () {
    $(window).scroll(function(){
        if ($(window).scrollTop()>100){
            $("#back_to_top").fadeIn(500);
        }
        else
        {
            $("#back_to_top").fadeOut(500);
        }
    });

    //當點擊跳轉鏈接后，回到頁面頂部位置

    $("#gotop").click(function(){
        $('body,html').animate({scrollTop:0},700);
        return false;
    });
});
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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