npm install -s socket.io
npm install -s vue-socket.io
npm install -s socket.io-client

var sever=require('http').createServer();
var io=require('socket.io')(sever)

io.on('connection', function (socket) {
  socket.on('login',function(data){ //接收连接中的login事件
    console.log(data);
    io.emit('loginmsg','你发过来的数据是：'+data) //发送回去 事件名为loginmsg
   })

})
console.log('socket端口：8000');
sever.listen(8000)

script{ "server": "node sever/app.js"}

import VueSocketio from 'vue-socket.io';
import socketio from 'socket.io-client';
Vue.use(VueSocketio, socketio('ws://127.0.0.1:8000'));//与websocket服务端链接

<template>
  <div>
    <div> 
      <input type="text" v-model="msg">
      <button @click='Login'>向8000端口发送数据</button>
      {{backdata}}
    </div>

  </div>
</template>
<script>
export default{
  data:function (){
    return {
      msg:"aaaa",
      backdata:'',
    }
  },
  sockets:{ //在此接收又服务器发送过来的数据 ps：注意此处的方法名要与服务器的发送的事件保持一致才能接收到
   connect:function() {      //与ws:127.0.0.1:8000连接后回调
    console.log('连接成功');
   },
   loginmsg:function(value) {
    console.log(value);//监听login(后端向前端emit login的回调)
    this.backdata=value;
   }
  },
  methods:{
    Login(){
      this.$socket.emit('login',this.msg);
    }
  }
   
 }
</script>