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<div style="background-color:#959822; width:100%;height:150px;">請滾動鼠標使頁面向下</div>
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<div style="background-color:Blue; width:100%;height:150px;">柯樂義</div>
<div style="background-color:Olive; width:100%;height:150px;">柯樂義 監視下滾像素</div>
<div style="background-color:Green; width:100%;height:150px;">A</div>
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<div style="background-color:Orange; width:100%;height:150px;">完整代碼</div>
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$(function () {
//當滾動條的位置處于距頂部200像素以下時，頂部導航出現，否則消失
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if ($(window).scrollTop() > 200) {
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else {
$("#topmenu_keleyi_com").fadeOut(100);
}
});
});
});
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