一种简单的实现，是通过jquery的scrollTo(0, 0);。
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "">
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
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<script type="text/javascript" src="test/js/jquery-1.11.1.min.js"></script>
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<title></title>
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</head>
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<body>
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<div>
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<div style="height:1000px;">初始化</div>
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<div style="height:1000px">
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<div
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style="position:fixed;right:10px;bottom:50px;width:20px;height:70px;background-color:red;cursor:hand;"
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onclick="scrollTo(0, 0)">返回顶端</div>
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</div>
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</body>
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</html>
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