How to add and subtract date in JS _ javascript tips-js tutorial

This article mainly introduces how to add and subtract dates in Javascript. If you need it, refer to it.

Effect: molding date-age = required test date!

Event:

This event is triggered when the molding date text box is changed!
Triggered when the age text box is changed!
Code:
(Note: molding date ID: tbcxrq age ID: tblq required test date ID: tbyqsyrq)

The Code is as follows: