Call between html iframe elements, iframe call

Call between html iframe elements, iframe call

Call between html iframe elements
I. Introduction
Iframe is usually used when an independent page needs to be introduced. When necessary, we need to interact between the parent page and the iframe page. When interacting, we need to make
Javascript or jquery is used to operate on the relevant elements in the parent or child pages.
Ii. Example
1. The page structure is as follows:

Parent page:

1 <! DOCTYPE html> 2 
Subpage 1
1 <! DOCTYPE html> 2 
Subpage 2
1 <! DOCTYPE html> 2 
Shows the page effect: