方法是设置prototype实例变量使其指向继承链的父。

You'll set a prototype instance variable to point to the parent in the inheritance chain.

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如果控件句柄尚不存在，则此方法沿控件的父级链搜索，直到它找到有窗口句柄的控件或窗体为止。

If the control's handle does not exist yet, this method searches up the control's parent chain until it finds a control or form that does have a window handle.

youdao

如果控件句柄尚不存在，则此方法沿控件的父级链搜索，直到它找到有窗口句柄的控件或窗体为止。

If the control's handle does not exist yet, this method searches up the control's parent chain until it finds a control or form that does have a window handle.

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