Javascript环境变量

Question

如果可以在Firefox上运行的页面中使用Javascript读取环境变量，请告诉我。

Answer 1

不，JavaScript是沙箱来防止这种事情。

Answer 2

Short answer: No.

Long answer: Maybe. If you mean system environment variables, there isn't (that I'm aware of) any way to do that via straight JavaScript. You can access a number of system information through JavaScript though. Check this page out for some examples:

http://www.docsteve.com/DocSteve/Samples/JS/javascript_env.html

This shows how to get the underlying OS/platform, Depending on exactly what you're looking for, this may not work. It's possible via other methods, like creating an ActiveX object and using that. However, this requires additional steps on the user end (like installing/authorizing ActiveX).

I think this is a security feature, separating the system from the browser, therefore it can be difficult (or impossible, depending on your requirements).