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从background scripts中发送单个消息 (or other privileged scripts, such as popup scripts or options page scripts) 到任何content scripts that belong to the extension and are running in the specified tab.

这个消息将被content scripts中 runtime.onMessage 事件的所有监听者收到,然后它们可以选择通过使用 sendResponse 这个方法发送一个response到background scripts。

This is an asynchronous function that returns a Promise.

Syntax

var sending = browser.tabs.sendMessage(
  tabId,                   // integer
  message,                 // any
  options                  // optional object
)

Parameters

tabId
integer. ID of the tab whose content scripts we want to send a message to.
message
any. An object that can be serialized to JSON.
options可选
object.
frameId可选
integer. Sends the message to a specific frame identified by frameId instead of all frames in the tab. Whether the content script is executed in all frames depends on the all_frames setting in the content_scripts section of manifest.json.

Return value

A Promise that will be fulfilled with the JSON response object sent by the handler of the message in the content script, or with no arguments if the content script did not send a response. If an error occurs while connecting to the specified tab or any other error occurs, the promise will be rejected with an error message. If several frames response to the message, the promise is resolved to one of answers.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxOperaFirefox for Android
Basic supportChrome Full support YesEdge Full support 14
Notes
Full support 14
Notes
Notes No response is sent after the receiving tab is refreshed if there is no `runtime.onMessage` listener.
Firefox Full support 45Opera Full support YesFirefox Android Full support 54

Legend

Full support  
Full support
See implementation notes.
See implementation notes.

Examples

Here's an example of a background script that sends a message to the content scripts running in the active tab when the user clicks the browser action. The background script also expects the content script to send a response:

// background-script.js
"use strict";

function onError(error) {
  console.error(`Error: ${error}`);
}

function sendMessageToTabs(tabs) {
  for (let tab of tabs) {
    browser.tabs.sendMessage(
      tab.id,
      {greeting: "Hi from background script"}
    ).then(response => {
      console.log("Message from the content script:");
      console.log(response.response);
    }).catch(onError);
  }
}

browser.browserAction.onClicked.addListener(() => {
  browser.tabs.query({
    currentWindow: true,
    active: true
  }).then(sendMessageToTabs).catch(onError);
});

Here's the corresponding content script:

// content-script.js
"use strict";

browser.runtime.onMessage.addListener(request => {
  console.log("Message from the background script:");
  console.log(request.greeting);
  return Promise.resolve({response: "Hi from content script"});
});

Example extensions

Acknowledgements

This API is based on Chromium's chrome.tabs API. This documentation is derived from tabs.json in the Chromium code.

Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.

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