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<title>无标题文档</title>
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<script language="javaScript">
now = new Date(),hour = now.getHours()
if(hour < 6){document.write("凌晨好！")}
else if (hour < 9){document.write("早上好！")}
else if (hour < 12){document.write("上午好！")}
else if (hour < 14){document.write("中午好！")}
else if (hour < 17){document.write("下午好！")}
else if (hour < 19){document.write("傍晚好！")}
else if (hour < 22){document.write("晚上好！")}
else {document.write("夜里好！")}
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原文：http://www.cnblogs.com/tanlingdangan/p/4152068.html