JS Location.href jump out of the frame to open a new page

Later in the framework, when the login failed to return to the login page, but the login page is open in the frame, I want it to jump out of the frame directly, this is not open a new window.

echo "<script language=\" javascript\ ">alert (' login is invalid or not logged in, please login! "Location.href= ' login.php ';</script>";
The original content is like this, to let it jump out of the frame to open the login page, method:
echo "<script language=\" javascript\ ">alert (' login is invalid or not logged in, please login! "Window.top.location.href= ' login.php ';</script>";
In fact, in the jump link before adding a window.top. If you open a new window, you can use the JS window.open ("url", "open Mode"); To open a new window.

JS Location.href jump out of the frame to open a new page