window.opener & window.parent & window.top

when to use window opener/ window parent/ window top?

http://stackoverflow.com/questions/11313045/when-to-use-window-opener-window-parent-window-top

從這篇中擷取答案重點如下:

window.opener:

--> refers to the window that called window.open( ... ) to open the window from which it's called

window.parent:

--> refers to the parent of a window in a <frame> or <iframe>

window.top: 

--> refers to the top-most window from a window nested in one or more layers of <iframe> sub-windows

最後, 介紹一下window.parent,

window.parent:

--> A reference to the parent of the current window or subframe.

--> If a window does not have a parent, its parent property is a reference to itself.

--> When a window is loaded in an <iframe>, <object>, or <frame>, its parent is the window with the element embedding the window.

Window parent Property:

http://www.w3schools.com/jsref/prop_win_parent.asp

https://developer.mozilla.org/en-US/docs/Web/API/Window/parent