websocket使用方法的基本例子代码

 window.stompClient;

    const stompConfig = {
      // Typically, login, passcode and vhost
      // Adjust these for your broker
      connectHeaders: {
        login: "guest",
        passcode: "guest",
        broadcast: "123"
      },

      // Broker URL, should start with ws:// or wss:// - adjust for your broker setup
      brokerURL: "ws://172.3.3.160:20000/streaming/ws",

      // Keep it off for production, it can be quit verbose
      // Skip this key to disable
      debug: function (str) {
        console.log('STOMP: ' + str);
      },

      // If disconnected, it will retry after 200ms
      reconnectDelay: 200,

      // Subscriptions should be done inside onConnect as those need to reinstated when the broker reconnects
      onConnect: function (frame) {
        // The return object has a method called `unsubscribe`
        const subscription = stompClient.subscribe('/topic/chat', function (message) {
          const payload = JSON.parse(message.body);
          displayIncomingMessage(payload.user, payload.usrMsg);
        });
      }
    };

    // Create an instance
    stompClient = new StompJs.Client(stompConfig);
stompClient.activate();