Chrome扩展程序:端口错误:无法建立连接.接收端不存在.

Question

尝试在我的内容和后台脚本之间进行通信时,我收到以下错误:

Port error: Could not establish connection. Receiving end does not exist.
Error in event handler for 'undefined': Cannot read property 'message' of undefined       
TypeError: Cannot read property 'message' of undefined

background.js

function onRequest(request, sender, callbackFunction) {
    console.log("Me (BS) became this Message:" + request.message);
    sendResponse({message: request.message})
};
chrome.extension.onRequest.addListener(onRequest);

streamcloud.js

function contactBackground(nachricht){
    chrome.extension.sendMessage({message: nachricht}, function(response) {
        console.log("The Background Script got the following Message: " + response.message);
    });
}

和我的manifest.json

{
  "name": "InstantWatch - Dev",
  "manifest_version": 2,
  "version": "0.7",
  "permissions": ["tabs", "http://*/", "https://*/"],
  "background": {
    "scripts": ["background.js"]
  },  
  "browser_action": {
    "default_title": "InstantWatch",
    "default_icon" : "icon.ico"
  },
  "content_scripts": [
    {
      "matches": ["http://*/*", "http://*/*"],
      "js": ["jquery.js", "streamcloud.js"]
    }
  ]
}

我找到了添加background_page的解决方案:"background.html",其中包含空的background.html,但由于manifest_version:2不支持background_page,所以我无法使用它.

Answer 1

sendMessage并且onRequest是不兼容.

如果您需要支持Chrome 19及更早版本,请使用onRequest和sendRequest:

chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
    // Warning: Chrome 19- [receiver]
});
chrome.extension.sendRequest(message, optional_sendResponse);

对于Chrome 20 - 25,请使用和:chrome.extension.onMessagechrome.extension.sendMessage

chrome.extension.onMessage.addListener(function(request, sender, sendResponse) {
    // Chrome 20+
});
chrome.extension.sendMessage(message, optional_sendResponse);

对于Chrome 26+,请使用和.chrome.runtime.onMessagechrome.runtime.sendMessage

注意:从Chrome 26开始,仍然支持已弃用的方法,尽管没有记录.如果您有机会,请更新您的扩展程序以使用新方法,以确保您的扩展程序将来仍可使用.
有关创建与Chrome 20+兼容的代码,请参阅此答案.