Window: sự kiện message

Cú pháp

Sử dụng tên sự kiện trong các phương thức như addEventListener(), hoặc thiết lập thuộc tính trình xử lý sự kiện.

addEventListener("message", (event) => { })

onmessage = (event) => { }

Kiểu sự kiện

A MessageEvent. Inherits from Event.

Event properties

This interface also inherits properties from its parent, Event.

MessageEvent.data Read only

The data sent by the message emitter.

MessageEvent.origin Read only

A string representing the origin of the message emitter.

MessageEvent.lastEventId Read only

A string representing a unique ID for the event.

MessageEvent.source Read only

A MessageEventSource (which can be a WindowProxy, MessagePort, or ServiceWorker object) representing the message emitter.

MessageEvent.ports Read only

An array of MessagePort objects representing the ports associated with the channel the message is being sent through (where appropriate, e.g., in channel messaging or when sending a message to a shared worker).

Ví dụ

Suppose a script sends a message to a different browsing context, such as another <iframe>, using code like this:

const targetFrame = window.top.frames[1];
const targetOrigin = "https://example.org";
const windowMessageButton = document.querySelector("#window-message");

windowMessageButton.addEventListener("click", () => {
  targetFrame.postMessage("hello there", targetOrigin);
});

The receiver can listen for the message using addEventListener() with code like this:

window.addEventListener("message", (event) => {
  console.log(`Received message: ${event.data}`);
});

Alternatively the listener could use the onmessage event handler property:

window.onmessage = (event) => {
  console.log(`Received message: ${event.data}`);
};

Đặc tả kỹ thuật

Tính tương thích trên trình duyệt

Xem thêm

• Related events: messageerror.
• Window.postMessage().