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Every menu has ten new properties, the values of which are the same for all menus in the tree.
The function checks the array element for a value. If no value exists, the default parameter variable value is assigned. In the case of menuLeft and menuTop , where no defaults exist, the array element value is assigned directly. In version 2, this was always the top-level menu. In version 3, every top-level menu has a startChild property which stores the menu that you want to display as the first one in the hierarchy.