1.下载vant-weapp的dist文件
2.在项目中创建一个文件叫wxcomponents，注意这个文件和page文件平级，引入dist

注意文件名一定要是wxcomponents（莫名其妙的坑），
3.APP.VUE里引入样式

<style lang="scss">
  @import "@/wxcomponents/vant/common/index.wxss";
</style>

4.pages.json全局注册

"globalStyle": {
		"navigationBarTextStyle": "black",
		"navigationBarTitleText": "RuoYi",
		"navigationBarBackgroundColor": "#FFFFFF",
		 "usingComponents": { //这里为方便，全局引入了所有组件，也可以在某个page下单独引用某个组件
			//"demo-block": "/wxcomponents/vant/demo-block/index",
			"van-action-sheet": "/wxcomponents/vant/action-sheet/index",
			"van-area": "/wxcomponents/vant/area/index",
			// "van-badge": "/wxcomponents/vant/badge/index",
			// "van-badge-group": "/wxcomponents/vant/badge-group/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-switch-cell": "/wxcomponents/vant/switch-cell/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"
		}
	
   } 

5.报错引入css报错

@import '../common/index.css';.van-icon{text-rendering:auto;-webkit-font-smoothing:antialiased;font:normal normal normal 14px/1 vant-

index.wxss里的 url(前面加空格全局替换(引入的字体图标路径有问题