小编典典

Chrome扩展程序:端口错误:无法建立连接。接收端不存在。

javascript

尝试在内容脚本和后台脚本之间进行通信时,出现以下错误:

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"]
    }
  ]
}

我找到了添加一个background_page:“
background.html”和一个空白background.html的解决方案,但是由于manifest_version:2不支持background_page,所以我不能使用它。


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2020-05-01

共1个答案

小编典典

sendMessage并且onRequest不兼容

如果您需要支持 Chrome 19及更早版本 ,请使用 onRequestsendRequest

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. **onMessage**``chrome.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,仍支持不推荐使用的方法,尽管未记录。如果有机会,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然可以使用。

2020-05-01