浏览器内使用原生websocket接口的测试如下：

            let count = 0;

            let ws = new WebSocket('ws://localhost:3000/ws/chat');

            ws.onopen =  function () {
                console.log(`[CLIENT] open()`);
                ws.send('Hello!');
            };

            ws.onmessage = function (message) {
                console.log(`[CLIENT] Received: ${message}`);
                count++;
                if (count > 3) {
                    ws.send('Goodbye!');
                    ws.close();
                } else {
                    setTimeout(() => {
                        ws.send(`Hello, I'm Mr No.${count}!`);
                    }, 1000);
                }
            };