在javascript中嘲笑一个useragent？ [英] Mocking a useragent in javascript?

问题描述

我正在寻找一种以编程方式动态更改navigator.userAgent的方法。在我尝试获得自动javascript单元测试器失败的尝试中，我放弃并试图开始使用fireunit。我立即猛烈闯入使用实际浏览器进行javascript测试的墙壁之一。

I'm looking for a way to programmatically change navigator.userAgent on the fly. In my failed attempt to get an automated javascript unit tester, I gave up and attempted to begin using fireunit. Immediately, I've slammed into one of the walls of using an actual browser for javascript testing.

具体来说，我需要更改navigator.userAgent来模拟几百个userAgent字符串，以确保在给定的功能上正确检测和覆盖。 navigator.userAgent只读，所以我好像卡住了！我怎么能模拟navigator.userAgent？用户代理切换器（插件）可以切换FF的useragent，但是我可以在javascript中执行吗？

Specifically, I need to change navigator.userAgent to simulate a few hundred userAgent strings to ensure proper detection and coverage on a given function. navigator.userAgent is readonly, so I seem stuck! How can I mock navigator.userAgent? User Agent Switcher (plugin) can switch FF's useragent, but can I do it within javascript?

推荐答案

尝试：

navigator.__defineGetter__('userAgent', function(){
    return 'foo' // customized user agent
});

navigator.userAgent; // 'foo'

在FF2和FF3中尝试过。

Tried it in FF2 and FF3.

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