menu-aim 是一个 jQuery 下拉菜单插件，该插件能够甄别用户是尝试移动鼠标到下拉列表项还是将鼠标移至子菜单内容上。(menu-aim is a jQuery plugin for dropdown menus that can differentiate between a user trying hover over a dropdown item vs trying to navigate into a submenu's contents.)