在使用wordpress建站的过程中，我们想在不同的分类里显示不同的菜单，今天我们就介绍一下给电影分类（别名：movies）和电子书分类（别名：books）添加自己的导航菜单。原理是先通过 register_my_menus() 这个函数注册电影和电子书导航位置，再通过 wp_nav_menu() 函数调用。
第一步：切换到主题，打开functions.PHP文件，加入以下代码来注册导航菜单位置
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