chrome.runtime.onMessage 在后台脚本中未定义(chrome 扩展) [英] chrome.runtime.onMessage undefined in background script (chrome extension)

问题描述

我正在尝试创建一个 chrome 扩展，但由于某些原因，有时 chrome.runtime 对象似乎不完整，并且缺少很多方法(包括我想要的 onMessage).

I am trying to create a chrome extension, but for some reasons, sometimes, the chrome.runtime object seems incomplete, and a lot of methods are missing (including onMessage, which is the one I want).

似乎有时有效，有时无效.我认为这可能是与时间相关的问题，但我不明白为什么我不能简单地在后台创建消息监听器?

It seems sometimes it works, sometimes not. I assumed it may be a time related issue, but I don't understand why I can't simply create a message listener on background?

我的后台脚本:

setTimeout(function () {
    console.log("gogo!");
    chrome.runtime.onMessage.addListener(
        function(request, sender, sendResponse) {
            console.log(sender.tab ?
                        "from a content script:" + sender.tab.url :
                        "from the extension");
            if (request.type == "tab") {
                console.log("tab!");
                sendResponse({status: "ok"});
            }
        }),
    2
});

其中chrome.runtime.onMessage"未定义.

Where "chrome.runtime.onMessage" is undefined.

谢谢！

Edit2:我构建了一个简单得多的原型，但它又失败了.现在我真的很困惑.这是我所拥有的:

I have built a much simpler prototype, and it's failing again. Now I am really confused. Here is what I have:

$tree
.
├── manifest.json
├── src
│   ├── background.html
│   ├── background.js
│   └── test.js
└── vendor
    └── jquery.js

2 directories, 5 files

manifest.json 文件:

manifest.json file:

{
    "manifest_version": 2,

    "name": "test",
    "description": "test",
    "version": "1.0",
    "author": "test",

    "homepage_url": "http://www.test.com",

    "content_scripts": [
        {
            "run_at" : "document_idle",
            "matches": ["https://www.google*"],
            "js": ["vendor/jquery.js", "src/test.js"]
        }
    ],

    "background": {
        "page": "src/background.html",
        "persistent": false
    },

    "permissions": [
        "tabs",
        "https://www.google*"
    ]
}

background.html 文件:

background.html file:

<script src="../vendor/jquery.js"></script>
<script src="background.js"></script>

background.js 文件:

background.js file:

function run () {
    console.log("gogo!");
    chrome.runtime.onMessage.addListener(
        function(request, sender, sendResponse) {
            console.log(sender.tab ?
                        "from a content script:" + sender.tab.url :
                        "from the extension");
            if (request.type == "tab") {
                console.log("tab!");
                sendResponse({status: "ok"});
            }
        });
}

run();

test.js 文件:

test.js file:

'use strict';

run();

function run() {
    var url = window.location.href;

    // Error if no URI
    if (!url) {
        return 1;
    }

    var uriRe = /https://www.google.*/;
    var reParse = uriRe.exec(url);
    if (!reParse) {
        return 2;
    }

    chrome.runtime.sendMessage({type: "tab"}, function(response) {
        console.log(response);
    });
}

我在 OSX 上使用 Chrome 49.0.2623.112(64 位).

I am using Chrome 49.0.2623.112 (64-bit) on OSX.

这是失败时发生的屏幕截图:

Here is a screenshot of what happens the times it fails:

我想再次准确地说它不会一直失败(可能有 50% 的时间?)，这让它变得更加奇怪，让我相信在我不存在的地方存在某种竞争"情况知道.

I want to precise again that it doesn't fail all the time (maybe 50% of the time?), which makes it even more weird and makes me believe there is a kind of "race" condition somewhere I am not aware of.

推荐答案

问题已解决:我必须禁用，然后重新启用所有其他扩展.似乎是 Chrome 的一个错误.

Problem solved: I had to disable, then re-enable all my other extensions. Seems like a bug from Chrome.

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