Nuxt.js 引入 Element-UI

// package.json 添加 ---------------
...
"dependencies": {
  ...
  "nuxt": "^2.4.0",
}

// nuxt.config.js 添加 --------------
build: {
  transpile: [/^element-ui/]
}

plugins: [
  { src: '@/plugins/element-ui' }
]

css: [
  'element-ui/lib/theme-chalk/index.css'
],

// plugins 创建 element-ui.js -------------
import Vue from 'vue'
import ElementUI from 'element-ui'

Vue.use(ElementUI)