The oncommand attribute is key, because it establishes what happens when the user selects the menu item.

oncommand 属性非常关键，因为它可以确定当用户选择菜单项时发生什么操作。

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Notice the added script element within window, and the added attribute on the "Go!" button— oncommand="change_url(event)".

注意 window 内新增的 script 元素，以及对 “Go!” 按钮添加的属性 — oncommand="change_url(event)"。

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Others are special to XUL, like grippyhidden (which stops a menu bar from being hidden by the user) and oncommand (which is an event handler that fires when a menu option is chosen).

其他属性则是 XUL 专有的，比如 grippyhidden （不让用户隐藏某个菜单栏）和 oncommand （这是一个事件处理程序，当选中某个菜单项时激活）。

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