后台（一）vue+element-ui （按需加载）

vue init webpack    项目名称 

npm install axios                    //先安装！

npm install --save axios vue-axios   //然后！

npm install vuex --save              //安装vuex

npm i element-ui -S                        //安装vant，Ui框架，选择性安装

npm install babel-plugin-import -D            // 与element-ui是绑定安装关系

配置babelrc文件

{
  "presets": [
    [
      "env",
      {
        "modules": false,
        "targets": {
          "browsers": [
            "> 1%",
            "last 2 versions",
            "not ie <= 8"
          ]
        }
      }
    ],
    "stage-2"
  ],
  "plugins": [
    "transform-vue-jsx",
    "transform-runtime",
    [
      "component",
      {
        "libraryName": "element-ui",
        "styleLibraryName": "theme-chalk"
      }
    ]
  ],
  "env": {
    "test": {
      "presets": [
        "env",
        "stage-2"
      ]
    }
  }
}

或者

  "plugins": [["component", [
    {
      "libraryName": "element-ui",
      "styleLibraryName": "theme-chalk"
    }
  ]]],

如果报错

npm install babel-plugin-component --save-dev

npm run dev