mpvue 使用npm

1. 在mpvue 按文档使用
   1.1 安装
   1.2

   
     "usingComponents": {
       "van-button": "@vant/weapp/button/index",
       "van-toast": "@vant/weapp/toast/index",
       "van-row": "@vant/weapp/row/index",
       "van-col": "@vant/weapp/col/index",
       "van-image": "@vant/weapp/image/index"
     }
   

2 在微信小程序构建npm
安装npm
npm init 全部默认
安装 npm