javascript - Chrome 扩展消息传递

Question

这个问题已经有答案了:

Chrome Extension Message passing: response not sent (4 个回答)

已关闭 8 年前。

我有一个正在发送登录消息的 Chrome 扩展程序:

chrome.runtime.sendMessage data, (response) ->
  debugger
  if response.api_key
    $("body").fadeOut 1000, -> window.close()

  else
    App.Ui.clearForm()
    App.Ui.showErrorMessage()

但是，回调永远不会被命中:

chrome.runtime.onMessage.addListener (request, sender, sendResponse) ->
  if request and request.action is "login"

    $.ajax(
      type: "POST"
      url: App.Config.authUrl()
      data: request.data
      dataType: "json"
    ).then( (data) ->

      App.Storage.saveSession(data.user)
      sendResponse(data.user)

    , (data) ->

      sendResponse(data)

    )

我做错了什么吗？

Answer 1

参见documentation for onMessage关于sendResponse:

This function becomes invalid when the event listener returns, unless you return true from the event listener to indicate you wish to send a response asynchronously (this will keep the message channel open to the other end until sendResponse is called).

因此，要修复您的代码，您需要在异步调用后在监听器中返回 true。