The _javascript technique of using the value between IFRAME and the child page and the parent page in JS

In JS, we often use the IFRAME to do system framework, in the child page also, the parent page between the value transfer is a problem, the following is JS get the parent form and subform Object JS:

1. Get the elements of the parent page in the IFRAME child page :
A>window.parent.document This is the object that gets the parent page document;
B> If you want to get the method in the parent page JS: window.parent.xxxx (); xxxx () is the method;

2. Get the elements from the IFRAME child page in the parent page :
A>

Copy Code code as follows:

var child = document.getelementbyidx_x ("MainFrame"). Contentwindow;//mainframe this ID is the ID of the parent page iframe
child.document;//gets the document object in the child page;