就是设备上网的时候会向网站发送的 User-Agent 信息。我先上几个
Windows 10; FireFox 63
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0
Windows 10; Chrome 70
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36
Windows 10; Edge 42
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/17.17134
Android 8; FireFox 62
User-Agent: Mozilla/5.0 (Android 8.0.0; Mobile; rv:62.0) Gecko/62.0 Firefox/62.0
Android 8; Chrome 69
User-Agent: Mozilla/5.0 (Linux; Android 8.0.0; MI 6 Build/OPR1.170623.027) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36
Android 8; WeChat 6.7.3
User-Agent: Dalvik/2.1.0 (Linux; U; Android 8.0.0; MI 6 MIUI/8.9.20)
Android 8; Weibo.Intl 2.8.8
User-Agent: okhttp/2.4.0
欢迎补充,特缺苹果系列 UA 信息,如 iPhone XS Max。别问我干嘛用,除了装 B 没啥用。