Stepped on a lot of pits, there are shortcuts for other places.
May be the reason applet cloud development has just started it.
The final problem is solved with the official website of the document.
https://developers.weixin.qq.com/miniprogram/dev/wxcloud/basis/getting-started.html
As for UI effects can Vant:
https://youzan.github.io/vant/#/zh-CN/search
If you have not played before van, you can not directly use, to see a small cloud development program video can be solved.