您需要position:fixed;在页脚中：
<body>
<header style="min-height: 255px;">
</header>
<article style="padding-bottom: 60px; width: 900px; margin: 0 auto;">
Body text goes here.
</article>
<footer style="position: fixed; bottom: 0px; width: 100%; height: 60px; background-color: black;">
Copyright information
</footer>
</body>
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