后端是使用的springboot，socketio版本为1.7.11

<dependency>
    <groupId>com.corundumstudio.socketio</groupId>
    <artifactId>netty-socketio</artifactId>
    <version>1.7.11</version>
</dependency>

由于后端版本问题，前端socketio安装版本不能太高，不然就会连接不上，这个问题也是查了很久才发现是版本问题

npm install socket.io-client@2.3.1

io.js

import io from 'socket.io-client'
const socket = io('http://127.0.0.1:9096', {
    query: {},
    transports: ['websocket', 'polling'],
    timeout: 5000,
})
export default socket

mian.js中引用

import { createApp } from 'vue'
import socket from './utils/io'

const app = createApp(App);
app.mount('#app')
app.config.globalProperties.$socket = socket;

页面中使用

<script lang="ts">
import {defineComponent,ref,getCurrentInstance,onMounted,onUnmounted } from 'vue'
export default defineComponent({
    setup(){
      const { proxy  }: any = getCurrentInstance()
      onMounted(() => {
        proxy.$socket.on('connect',()=>{
          console.log('socketio-connect')
        })
        proxy.$socket.on('message',(data) =>{
          console.log(data)
        });
      });
      onUnmounted(() => {
        proxy.$socket.removeAllListeners('connect');
        proxy.$socket.removeAllListeners('message');
      });
      let sendMessage = ()=>{
          console.log('发送消息')
          proxy.$socket.emit('message', {
              msgContent: "你好！" + new Date()
          });
      }
        return {
          sendMessage
        }
    }
})
</script>

有问题的地方欢迎指出