Add code comments (#756)
Add code comments (#756)

Supplementary function into the reference code comments
tianyong90/wechat,acgrid/wechat,overtrue/wechat,ac1982/wechat,allen05ren/wechat,overtrue/wechat,allen05ren/wechat,tianyong90/wechat,ac1982/wechat,acgrid/wechat