WebSocket.onclose
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
WebSocket.onclose 属性返回一个事件监听器，这个事件监听器将在 WebSocket 连接的readyState 变为 CLOSED时被调用，它接收一个名字为“close”的 CloseEvent 事件。
语法
WebSocket.onclose = function(event) {
console.log("WebSocket is closed now.");
};
值
规范
| Specification |
|---|
| WebSockets # dom-websocket-onclose |