本文介绍了一个用于返回浏览器窗口层级中最顶层窗口对象的属性——topWindow。该属性在处理嵌套框架时尤为有用，可以帮助开发者轻松地从子框架访问到顶层框架。
top Window - Window |
Summary
Returns a reference to the topmost window in the window hierarchy.
Syntax
var topWindow = window.top;
Notes
Where the window.parent property returns the immediate parent of the current window, window.top returns the topmost window in the hierarchy of window objects.
This property is especially useful when you are dealing with a window that is in a subframe of a parent or parents, and you want to get to the top-level frameset.
Specification
DOM Level 0. Not part of any standard.
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@compat
- IE6|IE7|FF1|FF2|FF3|OPERA|SAFARI2|SAFARI3|KONQ
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