如何使用javaScript更改浏览器User-Agent标头？
问题描述：
以下代码更改了浏览器控制台打印的属性（通过javaScript访问时），而不是与标头一起发送的实际Use-Agent字符串。
Following code changes property printed (when accessed through javaScript) by browser console and not the actual Use-Agent string sent with the header.
Object.defineProperty(navigator, 'userAgent', {
get: function () { return 'Mozilla/5.0 (Windows NT 6.2; WOW64;
rv:28.0) Gecko/20100101 Firefox/28.0)'; }
});
答
从页面本身是不可能的。用户代理字符串（在HTTP请求标头中发送）只能通过浏览器扩展或浏览器配置进行更改。
This isn't possible from the page itself. The user agent string (as sent in the HTTP request headers) can only be changed via browser extension or browser configuration.