12.添加到收藏夹和设为首页
<a href=# >设为首页</a>
<a href="javascript:window.external.AddFavorite('http://www.xuexuexi.com.com/','站长设计网')">收藏本站</a>
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13.记录并显示网页的最后修改时间
<script language=JavaScript>
document.write("最后更新时间: " + document.lastModified + "")
</script>
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