WebSocket.protocol

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

WebSocket.protocol 是个只读属性，用于返回服务器端选中的子协议的名字；这是一个在创建 WebSocket 对象时，在参数 protocols 中指定的字符串，当没有已建立的链接时为空串。

语法

var protocol = aWebSocket.protocol;

返回值

DOMString.

规范

Specification
WebSockets Standard
# ref-for-dom-websocket-protocol①

浏览器兼容性

BCD tables only load in the browser