前言
在制作顶部菜单的时候，都会要求制作弹出的二级菜单，新近的做法是用jQuery的来管制二级菜单的显示和过渡动画，但利用CSS3中的transform属性后，这所有都变得异样简略
先上成果
制作方法
外围就是利用了transform的区域位移办法，在配合上li标签的hover伪类和动画延时，从而简略实现了子菜单的显示
<nav> <ul> <li> <strong>home</strong> <div> <a href="">cms</a> <a href="">crm</a> </div> </li> <li> <strong>live</strong> <div> <a href="">java</a> <a href="">php</a> </div> </li> <li> <strong>pictrue</strong> <div> <a href="">mm</a> <a href="">dd</a> </div> </li> </ul></nav> *{ padding: 0; margin: 0; box-sizing: border-box; } body{ width: 100vw; height: 100vh; display: flex; flex-direction: column; justify-content: flex-start; align-items: center; } nav{ margin: 10px; } nav ul { list-style-type: none; height: 32px; display: flex; } nav ul li{ margin-right: 10px; } nav ul li strong{ text-transform: uppercase; background-color: #9b59b6; color: white; padding: 5px 30px; line-height: 30px; cursor: pointer; } nav ul li strong+div{ display: flex; flex-direction: column; background-color: #3498db; padding: 10px; transform: translateY(-110%); opacity: 0; transition: .3s; transform-origin: top; } nav ul li:hover div{ transform: translateY(0); opacity: 1; } nav ul li strong+div a{ color: white; text-decoration: none; text-transform: uppercase; padding: 5px 0; }