There is a relationship between the two windows. The parent window parent.htm Opening the sub-window SON.HTM sub-window can point to the parent window via Window.opener. This allows you to access the object of the parent window.
Advantages: It is convenient for value. As long as Window.opener points to the parent window, you can access all objects. Not only can you access a value, but also access to the parent window. Value length is unlimited. Disadvantages: There is a relationship between the two windows. That is to use Window .open open window. Can't cross domain.
Post.htm
Read.htm
