在JS代码中输入console.log(navigator.userAgent)便可打印出以下navigator.userAgent
IE的userAgent 判断是否有MSIE
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2)
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)
Mozilla/4.0 (compatible; MSIE 5.0; Windows NT)
Firefox的userAgent
Mozilla/5.0 (Windows; U; Windows NT 5.2) Gecko/2008070208 Firefox/3.0.1
Opera的userAgent 判断是否有Opera
Opera/9.27 (Windows NT 5.2; U; zh-cn)
Mozilla/5.0 (Macintosh; PPC Mac OS X; U; en) Opera 8.0
Safari的userAgent 判断 AppleWebKit Version Mobile Safari
Mozilla/5.0 (Windows; U; Windows NT 5.2) AppleWebKit/525.13 (KHTML, like Gecko) Version/3.1 Safari/525.13
Mozilla/5.0 (iPhone; U; CPU like Mac OS X) AppleWebKit/420.1 (KHTML, like Gecko) Version/3.0 Mobile/4A93 Safari/419.3
Chrome的userAgent 判断是否有 AppleWebKit Chrome
Mozilla/5.0 (Windows; U; Windows NT 5.2) AppleWebKit/525.13 (KHTML, like Gecko) Chrome/0.2.149.27 Safari/525.13
原文：http://www.cnblogs.com/liuyunqi/p/6365044.html