通常做法：
max-width:580px;
overflow:hidden;
white-space:nowrap;
text-overflow:ellipsis;
-o-text-overflow:ellipsis;
-moz-binding:url('../ellipsis.xml#ellipsis');
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http://www.zhangxinxu.com/wordpress/2009/09/%E5%85%B3%E4%BA%8E%E6%96%87%E5%AD%97%E5%86%85%E5%AE%B9%E6%BA%A2%E5%87%BA%E7%94%A8%E7%82%B9%E7%82%B9%E7%82%B9-%E7%9C%81%E7%95%A5%E5%8F%B7%E8%A1%A8%E7%A4%BA/#zxx_a
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