javascript - chrome 扩展中不存在 chrome.runtime.onConnect

Question

我在持久后台脚本(background.js)中有以下代码:

chrome.runtime.onConnect.addListener(function(port) {
    console.assert(port.name == "knockknock");
    port.onMessage.addListener(function(msg) {
        if (msg.joke == "Knock knock")
            port.postMessage({question: "Who's there?"});
        else if (msg.answer == "Madame")
            port.postMessage({question: "Madame who?"});
        else if (msg.answer == "Madame... Bovary")
            port.postMessage({question: "I don't get it."});
    });
});

当我在 Chrome 中加载/重新加载扩展程序时，我收到错误消息

Uncaught TypeError: Cannot call method 'addListener' of undefined 

该代码取自 Chrome 扩展的文档站点，因此它可能是工作代码，只是缺少一些设置。

list 看起来像:

{
    "manifest_version": 2,
    "name": "TestMessaging",
    "version": "1",
    "background" : {
        "scripts": ["background.js"],
        "persistent": false
    },
    "browser_action": {
        "default_icon" : "icon.png"
    },
    "content_scripts": [
        {
            "matches": ["http://*/*", "https://*/*"],
            "js": [
                "contentscript.js"
            ]
        }
    ],
    "permissions" : [
        "tabs",
        "https://*/*",
        "http://*/*"
    ]

}

谢谢你的帮助!

Answer 1

使用chrome.extension.onConnect相反(它可以用 chrome.extension.connect 触发)。