text: const WebSocket = require('ws')
  let href = 'ws://localhost:3000/listener'
  
  let ws = new WebSocket(href);
  
  // 打开WebSocket连接后立刻发送一条消息:
  ws.on('open', function () {
      // console.log(`[CLIENT] open()`);
      // ws.send('Hello!');
  })
  
  // 响应收到的消息:
  ws.on('message', function (message) {
    console.log('收到信息',message);
  
  })
  
  