websocket demo

js ====>node wstest.js

var ws = require('nodejs-websocket');

const PORT = 3000;
var server = ws.createServer((conn) => {
    console.log("链接成功");
    conn.on("error",()=>{
        console.log("error")
    });

    conn.on("close",(e)=>{
        console.log("连接关闭",e)    // 链接关闭原因一定要打出来，好排查问题;
    });

    conn.on("text",(data)=>{
        conn.send(`你好～～${data.toUpperCase()}`);
    });

})

server.listen(PORT,()=>{
    console.log("服务启动成功,监听了端口" + PORT);
})

html 文件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <input type="text" placeholder="请输入内容" />
    <button>发送请求</button>
    <div></div>

</body>
<script>
    var input = document.querySelector('input');
    var button = document.querySelector("button");
    var div = document.querySelector("div");
    var socket = new WebSocket("ws://127.0.0.1:3000");

    socket.addEventListener("open",()=>{
        div.innerHTML = "连接成功";
    })

    button.addEventListener('click',()=>{
        var value = input.value;
        socket.send(value);
        input.value = '';
    })

    socket.addEventListener('message',(e)=>{      // 这里不好接收json串，只能字符串，可以json先JSON.stringfiy 再JSON.parse 解析
        var dv = document.createElement("div");
        dv.innerHTML = e.data;
        div.appendChild(dv);
    })

</script>


</html>