# 示例2 聊天室
## 客户端
```html
WebSocket Demo
```
## 服务端
```js
// server.js
const ws = require("nodejs-websocket")
// 端口号
const PORT = 8080;
// 所有用户数
var count = 0;
// 监听事件
var server = ws.createServer(function (conn) {
console.log("New connection")
count++;
conn.user_name = "用户" + count;
broadcast(conn.user_name + "加入了聊天室");
// 接收客户端发送的数据
conn.on("text", function (data) {
console.log("Received "+data)
// conn.sendText(data)
broadcast(conn.user_name + "：" + data)
})
// 客户端断开
conn.on("close", function (code, reason) {
console.log("Connection closed")
broadcast(conn.user_name + "离开了聊天室")
})
// 客户端异常
conn.on("error", function (err) {
console.log('异常')
})
})
// 广播给所有用户
function broadcast(msg){
server.connections.forEach(function (conn) {
conn.sendText(msg)
})
}
// 启动服务
server.listen(PORT, () => {
console.log(`Server started on port ${PORT}`)
})
```