扩展程序如何访问其他页面中的全局变量 [英] How can extension access global variables in other pages

问题描述

有一个包含以下部分的网页：

 < script language =javascript> 
 var g_GlobalVar1 =全局变量1; 
< / script> 
  

那么如何访问变量 g_GlobalVar1 通过Firefox扩展脚本的 DOMContentLoaded 处理函数？ 为了安全起见，特权代码不直接访问网页，而是通过 .mozilla.org / en / XPCNativeWrapperrel =nofollow> XPCNativeWrapper 。这尤其意味着您通常无法读出网页添加的任何JavaScript属性。您可以绕过安全层并以 wnd的形式访问变量。 wrappedJSObject.g_GlobalVar1 但这不建议，你应该考虑使用一种替代方法（哪一个取决于你想要做的这个网页）。

There is a web page which contains the following parts:

<script language="javascript">
var g_GlobalVar1 = "Global Variable 1";
</script>

So how the variable g_GlobalVar1 can be accessed by the DOMContentLoaded handler function of the Firefox extension script?

解决方案

For security reasons, privileged code doesn't access web pages directly but through XPCNativeWrapper. This means in particular that you normally cannot read out any JavaScript properties that the web page added. You can bypass the security layer and access the variable as wnd.wrappedJSObject.g_GlobalVar1 but this isn't recommended and you should consider using an alternative approach (which one depends on what you are trying to do with this web page).

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