概述
在窗体的继承中,返回对顶层窗体的引用。
语法
var topWindow = window.top;
说明
window.parent属性返回当前窗体的父窗体,而window.top则返回当前窗体的最顶层窗体。该属性在框架集的处理中尤其有用。
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