handwriting-algorithm/30websocket.html at master · ustcfury/handwriting-algorithm · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        // 在index.html中直接写WebSocket，设置服务端的端口号为 9999
        let ws = new WebSocket('ws://localhost:9999');
        // 在客户端与服务端建立连接后触发
        ws.onopen = function () {
            console.log("Connection open.");
            ws.send('hello');
        };
        // 在服务端给客户端发来消息的时候触发
        ws.onmessage = function (res) {
            console.log(res);       // 打印的是MessageEvent对象
            console.log(res.data);  // 打印的是收到的消息
        };
        // 在客户端与服务端建立关闭后触发
        ws.onclose = function (evt) {
            console.log("Connection closed.");
        };
    </script>
</body>

</html>