Chrome扩展程序：通过注入调用页面脚本 [英] Chrome-extension: Invoke page script by injection

问题描述

是否可以将JavaScript文件注入DOM并立即执行？
我希望在页面/ DOM中调用javascript函数。由于孤立的世界，单个内容脚本将无法正常工作。需要背景页面才能使用 chrome.tabs.executeScript（）。

Is it possible to inject a javascript file into the DOM and immediately execute it ? I wish to invoke javascript functions within the page/DOM. A single content script will not work because of the isolated worlds. A background page is required to use chrome.tabs.executeScript().

简单示例： / strong>

DOM javascript

Simple Example:
DOM javascript

function sayHello(){
  alert('Hello World');
}

要注入的Javascript文件

Javascript file to inject

console.log('Injection complete. Now calling DOM script.');
sayHello();

推荐答案

这是我最喜欢的两种方式...

Here's my two favorite ways...

// Executing an anonymous script
function exec(fn) {
   var script = document.createElement('script');
   script.setAttribute("type", "application/javascript");
   script.textContent = '(' + fn + ')();';
   document.documentElement.appendChild(script); // run the script
   document.documentElement.removeChild(script); // clean up
}

script = function() {
//sayHello();
alert('hello');
}

exec(script);

// Append a script from a file in your extension
function appendScript(scriptFile) {
   var script = document.createElement('script');
   script.setAttribute("type", "application/javascript");
   script.setAttribute("src", chrome.extension.getURL(scriptFile));
   document.documentElement.appendChild(script); // run the script
}

appendScript('someFile.js');

另外 chrome.tabs.executeScript（）可以从浏览器/页面动作弹出窗口使用，上述代码也可以在内容脚本中使用。

Also chrome.tabs.executeScript() can be used from a browser/page action popup and the above code works in a content script aswell.

编辑

感谢@renocor的评论，这是第一种方法的变体，允许您向注入的函数发送参数。

EDIT
Thanks to comments by @renocor, here's a variation of the first method that allows you to send arguments to the injected function....

function exec(fn) {
    var args = '';
    if (arguments.length > 1) {
        for (var i = 1, end = arguments.length - 2; i <= end; i++) {
            args += typeof arguments[i]=='function' ? arguments[i] : JSON.stringify(arguments[i]) + ', ';
        }
        args += typeof arguments[i]=='function' ? arguments[arguments.length - 1] : JSON.stringify(arguments[arguments.length - 1]);
    }
    var script = document.createElement('script');
    script.setAttribute("type", "application/javascript");
    script.textContent = '(' + fn + ')(' + args + ');';
    document.documentElement.appendChild(script); // run the script
    document.documentElement.removeChild(script); // clean up
}

script = function(what, huh, nah, yeah) {
    console.debug(arguments);
    console.debug('what=', what);
    console.debug('huh=', huh);
    console.debug('nah=', nah);
    console.debug('yeah=', yeah);
    if (typeof yeah=='function') yeah();
}

exec(script, 'meh', ['bleh'], {
    a: {
        b: 0
    }
}, function(){
    alert('hi');
});

console.debug('No arguments');

exec(script);

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