原生nodejs使用websocket

安装：
```
npm  install  ws
```

服务端（nodejs）：

var WebSocketServer = require('ws').Server,
wss = new WebSocketServer({ port: 8080 });
wss.on('connection', function (ws) {
console.log('client connected');
ws.on('message', function (message) {
    console.log(message);
});
});

客户端：

<script>
var ws = new WebSocket("ws://localhost:8080");
ws.onopen = function (e) {
    console.log('Connection to server opened');
    sendMessage();
}
function sendMessage() {
    ws.send('hello');
}
</script>

测试：

原生nodejs使用websocket

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