window，window.top和window.parent有什么区别？ [英] What is the difference between window, window.top and window.parent?

问题描述

我只注意到顶部，窗口和父母变量给我相同的价值。我正在测试这在Gmail收件箱页面。是否有人知道这三个值之间有什么区别？

解决方案

如果你在一个框架内：

• window 引用当前帧。
  
• parent 引用当前帧的父级。
  
• top 引用最外框。
  
  
  

  如果你不在任何框架内，这些都将只是一个对当前窗口的引用。如果你只在一个框架内， parent 和 top 都将是对同一事物的引用。
  

  I just noticed that top, window and parent variables are giving me the same value. I was testing this at gmail inbox page. Does anybody know what is the difference between these three values?

  解决方案

  If you are within a frame:

  • window refers to the current frame.
  • parent refers to the parent of the current frame.
  • top refers to the outermost frame.

  If you're not within any frame, these will all just be a reference to the current window. If you're only within one level of frame, parent and top will both be a reference to the same thing.

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