worker

https://developers.weixin.qq.com/community/develop/doc/000ce0e461ca60cf1bc80c97d51800

https://developers.weixin.qq.com/miniprogram/dev/api/worker/wx.createWorker.html

https://blog.csdn.net/Joychen404/article/details/80415537

http://school.jisuapp.cn/wxdoc/SBikcO8_.html