出现的错误情况：
vue创建项目打开页面后可以运行正常，就是控制台一直隔几秒报websocket的connection错误
错误如下：
WebSocket connection to ‘ws://localhost:3000/ws’ failed: Error in connection establishment: net::ERR_CONNECTION_REFUSED
| WebSocketClient | @ | WebSocketClient.js?5586:16 | |
| initSocket | @ | socket.js?d6e0:24 | |
| eval | @ | socket.js?d6e0:48 |
解决方法：
在vue.config.js中进行下列的配置
const { defineConfig } = require('@vue/cli-service')module.exports = defineConfig({transpileDependencies: true,lintOnSave: false,//关闭语法检查devServer:{host: '0.0.0.0',port:3000,client: {webSocketURL: 'ws://0.0.0.0:3000/ws',},headers: {'Access-Control-Allow-Origin': '*',}}})