引入element-ui

nuxt.config.js

  css: [
    'assets/css/transition.css',
    'element-ui/lib/theme-chalk/index.css'
  ],
 plugins: [
    {
      src: '~/plugins/element-ui',
      ssr: true, //不支持服务端渲染不要给true
      // mode: 'server' // 模式服务端
    }
  ],
build: {
    transpile: [/^element-ui/]
  }

plugins===>element-ui

import element from 'element-ui';
import Vue from 'vue';

Vue.use(element)