安装@nuxtjs/axios, @/nuxtjs/proxy 插件 npm i @nuxtjs/ axios @/ nuxtjs/ proxy - S 
  modules :  [ "@nuxtjs/axios" , "@nuxtjs/proxy" , ] , axios :  { proxy :  true , } , proxy :  { "/api" :  { target :  "http://localhost:4000" , pathRewrite :  { "^/api" :  "" , } , } , } , 
使用nodejs启动一个localhost:4000的服务,写一个接口 const  http =  require ( "node:http" ) ; 
const  url =  require ( "node:url" ) ; http. createServer ( ( req,  res )  =>  { const  {  pathname }  =  url. parse ( req. url) ; if  ( pathname ===  "/api" )  { res. end ( "代理 4000 成功" ) ; } } ) . listen ( 4000 ,  ( )  =>  { console. log ( "启动4000服务" ) ; } ) ; 在pages中的某一个xxx.vue中使用asyncData函数调用下接口: async  asyncData ( {  $axios } )  { let  res =  $axios. get ( "/api" ) . then ( res => { } ) console. log ( "res222:" ,  res) ; return  { res, } ; } , 
前端启动的服务是3000,接口顺利调用成功,代表代理配置好了,解决了跨域