[Vue warn]: Unknown custom element: ＜el-row＞ - did you register the component correctly? For recursi

babel.config.js 文件中

module.exports = {
  presets: [
    '@vue/cli-plugin-babel/preset'
  ]
}

替换为

module.exports = {
  presets: [
    '@vue/cli-plugin-babel/preset',
		["@babel/preset-env", { "modules": false }],
  ],
	plugins:[
    [
      "component",
      {
        "libraryName": "element-ui",
        "styleLibraryName": "theme-chalk"
      }
    ]
  ]
}