uni-app项目中引入Vant UI组件库（完美避坑！！！）纯净版

第一步，HBuilder X中新建一个uni-app的项目

1、添加项目名称，选择文件路径
2、选择默认模板
3、Vue版本选择（若无其他需求，点击创建即可）

第二步，HBuilder X提示项目创建成功，在HBuilder X用命令行窗口打开创建的项目（或直接在创建的项目文件夹内用cmd指令打开）

第三步，输入npm init -y 指令，创建项目配置文件（即package.json）；

第四步，输入npm i @vant/weapp -S --production下载vant

安装完成后，项目中会多出一个依赖项，也代表安装成功

第五步，在项目的根路径下，创建wxcomponents目录，并将依赖项（node_modules）中@vant文件夹下的dist复制到wxcomponents，并修改文件夹名为vant;

第六步，在pages.json中注册并引入组件

以下为组件的全局注册，可根据需求按需导入组件：

"usingComponents": {
      "van-action-sheet": "/wxcomponents/vant/action-sheet/index",
      "van-area": "/wxcomponents/vant/area/index",
      "van-button": "/wxcomponents/vant/button/index",
      "van-card": "/wxcomponents/vant/card/index",
      "van-cell": "/wxcomponents/vant/cell/index",
      "van-cell-group": "/wxcomponents/vant/cell-group/index",
      "van-checkbox": "/wxcomponents/vant/checkbox/index",
      "van-checkbox-group": "/wxcomponents/vant/checkbox-group/index",
      "van-col": "/wxcomponents/vant/col/index",
      "van-dialog": "/wxcomponents/vant/dialog/index",
      "van-field": "/wxcomponents/vant/field/index",
      "van-goods-action": "/wxcomponents/vant/goods-action/index",
      "van-goods-action-icon": "/wxcomponents/vant/goods-action-icon/index",
      "van-goods-action-button": "/wxcomponents/vant/goods-action-button/index",
      "van-icon": "/wxcomponents/vant/icon/index",
      "van-loading": "/wxcomponents/vant/loading/index",
      "van-nav-bar": "/wxcomponents/vant/nav-bar/index",
      "van-notice-bar": "/wxcomponents/vant/notice-bar/index",
      "van-notify": "/wxcomponents/vant/notify/index",
      "van-panel": "/wxcomponents/vant/panel/index",
      "van-popup": "/wxcomponents/vant/popup/index",
      "van-progress": "/wxcomponents/vant/progress/index",
      "van-radio": "/wxcomponents/vant/radio/index",
      "van-radio-group": "/wxcomponents/vant/radio-group/index",
      "van-row": "/wxcomponents/vant/row/index",
      "van-search": "/wxcomponents/vant/search/index",
      "van-slider": "/wxcomponents/vant/slider/index",
      "van-stepper": "/wxcomponents/vant/stepper/index",
      "van-steps": "/wxcomponents/vant/steps/index",
      "van-submit-bar": "/wxcomponents/vant/submit-bar/index",
      "van-swipe-cell": "/wxcomponents/vant/swipe-cell/index",
      "van-switch": "/wxcomponents/vant/switch/index",
      "van-tab": "/wxcomponents/vant/tab/index",
      "van-tabs": "/wxcomponents/vant/tabs/index",
      "van-tabbar": "/wxcomponents/vant/tabbar/index",
      "van-tabbar-item": "/wxcomponents/vant/tabbar-item/index",
      "van-tag": "/wxcomponents/vant/tag/index",
      "van-toast": "/wxcomponents/vant/toast/index",
      "van-transition": "/wxcomponents/vant/transition/index",
      "van-tree-select": "/wxcomponents/vant/tree-select/index",
      "van-datetime-picker": "/wxcomponents/vant/datetime-picker/index",
      "van-rate": "/wxcomponents/vant/rate/index",
      "van-collapse": "/wxcomponents/vant/collapse/index",
      "van-collapse-item": "/wxcomponents/vant/collapse-item/index",
      "van-picker": "/wxcomponents/vant/picker/index"
    }

如此，即完成了Vant组件库的引入！