关于li:nth-child(1)
http://rd.189works.com/article-110434-1.html
http://www.cnblogs.com/belearner/archive/2013/02/20/2919211.html
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出处:http://cnblogs.com/daishuguang
http://rd.189works.com/article-110434-1.html
http://www.cnblogs.com/belearner/archive/2013/02/20/2919211.html
IE8不支持。