各大搜索引擎的蜘蛛User-Agent（UA）
百度：Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)搜狗：Sogou web spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07)
谷歌：Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
必应：Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)
好搜：Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0); 360Spider(compatible; HaosouSpider; http://www.haosou.com/help/help_3_2.html)
Yahoo：Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp)
神马：Yisouspider
有道：YoudaoBot
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