使用loadFrameScript,如何在页面的脚本执行之前注入文件? [英] Using loadFrameScript, how can inject file before the page's script execution?
问题描述
我目前在 bootstrap.js
文件中使用它。用于在我的情况下编辑客户端的JavaScript代码我正在使用 recentBrowserWindow.messageManager.loadFrameScript(file,true)
:
const {类:Cc,接口:Ci,utils:Cu,结果:Cr} =组件;
Cu.import('resource://gre/modules/Services.jsm');
var file ='chrome://testAddon/content/inject.js';
函数启动(aData,aReason){
var recentBrowserWindow = Services.wm.getMostRecentWindow('navigator:browser');
if(recentBrowserWindow.document.readyState =='complete'){
recentBrowserWindow.messageManager.loadFrameScript(file,true);
}
}
inject.js:
var window = content;
var pageJS = window.wrappedJSObject;
console.log(窗口中的jQuery被定义:,jQuery);
// true,jQuery已经分配在客户端页面上。
但是脚本 inject.js
是在客户端页面之后运行。问题是:
lockquote
如何在页面脚本之前注入 inject.js
执行?。我应该使用什么方法?
它使用插入文档元素
,this将确保您的脚本在页面脚本运行之前运行。
我没有太多关于框架脚本的经验,其他人将不得不验证我这一点。
I'm currently using this in the bootstrap.js
file. Is used to edit the client's JavaScript code in my case I'm using recentBrowserWindow.messageManager.loadFrameScript(file, true)
:
const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
Cu.import('resource://gre/modules/Services.jsm');
var file = 'chrome://testAddon/content/inject.js';
function startup(aData, aReason) {
var recentBrowserWindow = Services.wm.getMostRecentWindow('navigator:browser');
if(recentBrowserWindow.document.readyState == 'complete') {
recentBrowserWindow.messageManager.loadFrameScript(file, true);
}
}
inject.js:
var window = content;
var pageJS = window.wrappedJSObject;
console.log("jQuery is defined:", "jQuery" in window);
//true, jQuery is already assigned on client page.
But here the script inject.js
is running after of the client page. The question is:
How can inject
inject.js
just before the page's script execution?. What method should I use?
From: https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIFrameScriptLoader
It says to use document-element-inserted
, this will ensure your script runs before the page scripts run.
I don't have much experience with frame scripts, others will have to verify me on this.
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