The WebSocket.onmessage property is an event handler that is called when a message is received from the server. It is called with a MessageEvent. 
aWebSocket.onmessage = function(event) { console.debug("WebSocket message received:", event); };
An EventListener.
| Specification | 
|---|
| HTML Standard (HTML) # handler-websocket-onmessage  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
onmessage | 
4  | 
12  | 
7  | 
10  | 
12.1  | 
5  | 
≤37  | 
18  | 
7  | 
12.1  | 
4.2  | 
1.0  | 
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    https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/onmessage