IE：
1，F12进入开发人员工具
2，工具->更改用户代理字符串->自定义
3，在“友好名称”中填入”IE9″，在“用户代理字符串”中填入”new_user_agent“，然后点击“添加”按钮
4，选择新添加的User-Agent，点击“设置”按钮设为当前User-Agent
Firefox：
1，在地址栏输入”about:config”
2，新建 “general.useragent.override“项
3，输入新的UA值：”new_user_agent“
Chrome：
1，新建一个chrome.exe的快捷方式
2，右键快捷方式，在目标框尾部追加” –user-agent=”new_user_agent”
new_user_agent 应替换为以下常用 User-Agent 形式的内容：
Google Chrome
Chrome on Windows 10:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36
Chrome on Mac:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36
Chrome on Linux:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36
Mozilla Firefox
Mozilla Firefox on Windows 10:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:49.0) Gecko/20100101 Firefox/49.0
Mozilla Firefox on Ubuntu:
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:49.0) Gecko/20100101 Firefox/49.0
Mozilla Firefox on Mac:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_0; rv:49.0) Gecko/20100101 Firefox/49.0
IE
IE 11 on Windows 10:
Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko
Edge on Windows 10:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.79 Safari/537.36 Edge/14.14931
iPad
Safari for iPad
Mozilla/5.0 (iPad; CPU OS 10_0_2 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) Version/10.0 Mobile/14A456 Safari/602.1
Safari for iPhone
Mozilla/5.0 (iPhone; CPU iPhone OS 10_0_3 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) Version/10.0 Mobile/14A551 Safari/602.1
Android
Chrome for Android
Mozilla/5.0 (Linux; Android 6.0.1; HTV32 Build/MMB29M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Mobile Safari/537.36
Firefox for Android
Mozilla/5.0 (Android 6.0.1; Mobile; rv:49.0) Gecko/49.0 Firefox/49.0
