如何在<浏览器>操作窗口原型元件？ [英] How to manipulate window prototype in a <browser> element?

问题描述

$ b $ << browser src =.../> load，我将数据附加到它的 .contentWindow 中：

  frame.addEventListener（load，function（）{
 this.contentWindow.someMethod = function（）{}; 
}，true）; 
  

现在我想知道是否有办法做到这一点，进入< browser> 的窗口原型，或者任何Window原型，例如我可以在当前窗口中进行操作：

  // [W] indow是构造函数
 Window.prototype.test = function（）{alert（hello）; }; 
 // [w] indow是实例
 window.test（）; 
  

解决方案

目前有两种方法将属性注入窗口任何JavaScript代码运行之前。通常， content-document-global-created 通知更简单。另一个是实现 nsIDOMGlobalPropertyInitializer 界面 。两者都允许您在新窗口加载时，在窗口运行JavaScript代码之前得到通知。

以下是使用观察者通知进行操作的近似代码：

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;
Cu.import（resource：//gre/modules/XPCOMUtils.jsm）;

var myObserver =
{
QueryInterface：XPCOMUtils.generateQI（[Ci.nsIObserver，Ci.nsISupportsWeakReference]），

observe：function（subject ，topic，data）
{
if（topic ==content-document-global-created&&&
subject instanceof Ci.nsIDOMWindow&
subject .location.hostname ==example.com）
{
XPCNativeWrapper.unwrap（subject）.someMethod = function（）{};
}
}
};

var observerService = Cc [@ mozilla.org/observer-service;1]
.getService（Ci.nsIObserverService）;
observerService.addObserver（myObserver，content-document-global-created，true）;


What I'm doing right now is:

When <browser src="..." /> loads, I attach data into its .contentWindow:

frame.addEventListener("load",function(){
    this.contentWindow.someMethod = function(){};
},true);

Now I want to know if there is a way to do this earlier, into the <browser>'s window prototype, or any Window prototype, as for example I can do in the "current" window:

// [W]indow is the constructor
Window.prototype.test = function(){ alert("hello"); };
// [w]indow is the instance
window.test();

解决方案

There are currently two ways to inject properties into a window before any JavaScript code runs. Usually, content-document-global-created notification is simpler. The other is implementing nsIDOMGlobalPropertyInitializer interface. Both allow you to get notified when a new window loads and before that window runs JavaScript code.

Here is the approximate code for doing it with the observer notification:

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;
Cu.import("resource://gre/modules/XPCOMUtils.jsm");

var myObserver =
{
  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver, Ci.nsISupportsWeakReference]),

  observe: function(subject, topic, data)
  {
    if (topic == "content-document-global-created" &&
        subject instanceof Ci.nsIDOMWindow &&
        subject.location.hostname == "example.com")
    {
      XPCNativeWrapper.unwrap(subject).someMethod = function() {};
    }
  }
};

var observerService = Cc["@mozilla.org/observer-service;1"]
                        .getService(Ci.nsIObserverService);
observerService.addObserver(myObserver, "content-document-global-created", true);

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