How to display the title of the page within the frame in the title bar_Basic knowledge

As title.
The title you want to display in the title bar of the current page is the title of the page within the frame of the current page. How to do this?

For example, page A is:



< ;IFRAME width=100% height=100% frameborder=0 SCROLLING=no SRC='Page B'>


If you want How to display the title of page B between of page A?

Copy code The code is as follows:

top.document.title = document.title;