導入執行后

VM292:1 thirdScriptError 
 sdk uncaught third Error 
 module "miniprogram_npm/vant-weapp/mixins/transition" is not defined 
 Error: module "miniprogram_npm/vant-weapp/mixins/transition" is not defined
    at require (http://127.0.0.1:56368/appservice/__dev__/WAService.js:22:26700)
    at http://127.0.0.1:56368/appservice/__dev__/WAService.js:22:26448
    at http://127.0.0.1:56368/appservice/miniprogram_npm/vant-weapp/popup/index.js:5:19
    at require (http://127.0.0.1:56368/appservice/__dev__/WAService.js:22:26841)
    at <anonymous>:395:7
    at HTMLScriptElement.scriptLoaded (http://127.0.0.1:56368/appservice/appservice?t=1557802464868:4544:21)
        at HTMLScriptElement.script.onload (http://127.0.0.1:56368/appservice/appservice?t=1557802464868:4556:20)

解決方法：

你只需要把miniprogram_npm/vant-weapp里的組件文件夾都刪除，

之后再https://github.com/youzan/vant-weapp下載一份vant， 將dist文件夾（vant-weapp-dev/vant-weapp-dev/dist）中的文件復制到項目的miniprogram_npm/vant-weapp

即下載一份vant，之后替換掉項目中的文件

之后保存解決

總結

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