*.location.href usage:

*.location.href usage:
top.location.href= "url" opens URL in top-level page (out of frame)
self.location.href= "url" only opens the URL address on this page
parent.location.href= "url" opens the URL address in the parent window
this.location.href= "url" usage is consistent with Self's usage
if (top.location = = self.location) Determines whether the current location is the top level to disallow frame references
If you have a custom frame in the page, you can also change the parent self top to the name of the custom frame
The effect is to open the URL address in the Custom frame window

*.location.href usage: