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websocket服务端与客户端代码示例

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websocket服务端与客户端代码示例. ( json socket )

用到了ws库.

步骤:1安装ws

npm install ws

步骤2:服务端代码:

创建websocket.mjs文件,写入以下代码:

import { WebSocketServer } from "ws";

const server = new WebSocketServer({ port: 3000 });

server.on("connection", (socket) => {
  // send a message to the client
  socket.send(JSON.stringify({
    type: "hello from server",
    content: [ 1, "2" ]
  }));

  // receive a message from the client
  socket.on("message", (data) => {
    const packet = JSON.parse(data);

    switch (packet.type) {
      case "hello from client":
        console.log(packet.content)
        // ...
        break;
    }
  });
});

 

运行服务端代码:

node websocket.mjs

步骤3:编写客户端代码:

在目录中创建index.html

写入以下代码:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>HTML文档</title>
<meta name="keywords" content="">
<meta name="description" content="">
</head>

<body>
<script>

const socket = new WebSocket("ws://localhost:3000");

socket.addEventListener("open", () => {
  // send a message to the server
  socket.send(JSON.stringify({
    type: "hello from client",
    content: [ 3, "4" ]
  }));
});

// receive a message from the server
socket.addEventListener("message", ({ data }) => {
  const packet = JSON.parse(data);

  switch (packet.type) {
    case "hello from server":
        console.log(packet.content)
      // ...
      break;
  }
});
</script>

</body>
</html>

 

用浏览器打开index.html

按f12查看console输出即可.

 

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