How to pass values between Iframe in JS

1. On the iframe subpage, obtain the elements of the parent page:

A> retrieve parent parent.doc ument, which is the object in the document of the parent page;

B> if you want to obtain the method in the parent page js: window. parent. xxxx (); xxxx () is the method;

2. Obtain the elements in the iframe subpage on the parent page:

A>

Var child = document. getElementByIdx_x ("mainFrame"). contentWindow; // the id of mainFrame is the id of iframe of the parent page.

Child.doc ument; // obtain the document object in the subpage;