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以前的用户代理字符串：
IOS 5.1 - 什么是 iOS 5.1 用户代理字符串？iOS 5.0 - 什么是 iOS 5.0 用户代理字符串？iOS 4.0 - 什么是 iPhone 4 用户代理？
Mozilla/5.0 (iPad; CPU OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5355d Safari/8536.25 Mozilla/5.0 (iPhone; CPU iPhone OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Mobile/10A5376e