[分享]css3回转菜单

CSS3回转菜单是一种常见的动态菜单效果。它可以通过CSS3中的旋转属性实现菜单项的旋转展开和收起。

/* CSS样式代码 */
.container {
  position: relative;
}

.menu-item {
  position: absolute;
  width: 50px;
  height: 50px;
  background-color: #3498db;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
  cursor: pointer;
  transition: all 0.3s ease-in-out;
}

.menu-item:hover {
  transform: scale(1.2);
}

.menu-item.active {
  transform: rotate(360deg) scale(1.2);
}

.menu-item:nth-of-type(1) {
  bottom: 0;
  left: 50%;
  margin-left: -25px;
  z-index: 4;
}

.menu-item:nth-of-type(2) {
  bottom: 50%;
  left: 0;
  margin-bottom: -25px;
  z-index: 3;
}

.menu-item:nth-of-type(3) {
  bottom: 50%;
  right: 0;
  margin-bottom: -25px;
  z-index: 3;
}

.menu-item:nth-of-type(4) {
  top: 0;
  left: 50%;
  margin-left: -25px;
  z-index: 2;
}

.menu-item:nth-of-type(5) {
  top: 50%;
  left: 0;
  margin-top: -25px;
  z-index: 1;
}

.menu-item:nth-of-type(6) {
  top: 50%;
  right: 0;
  margin-top: -25px;
  z-index: 1;
}

.sub-menu {
  position: absolute;
  width: 100px;
  height: 100px;
  background-color: #fff;
  border-radius: 50%;
  box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease-in-out;
}

.menu-item.active .sub-menu {
  opacity: 1;
  pointer-events: auto;
}

.sub-menu-item {
  width: 30px;
  height: 30px;
  background-color: #ccc;
  border-radius: 50%;
  margin: 8px;
  cursor: pointer;
  transition: all 0.3s ease-in-out;
}

.sub-menu-item:hover {
  transform: scale(1.2);
} 

以上是一个CSS3回转菜单的基本样式代码。其中，菜单项通过设置position属性为absolute，以及通过nth-of-type选择器和不同的margin值分别从不同的位置展开。菜单项的hover效果通过transform属性实现。当用户点击一个菜单项时，它会添加一个active类名，同时展开对应的子菜单。

子菜单通过设置position属性为absolute和opacity属性为0隐藏。当它的父菜单项被点击时，它会通过设置opacity为1和pointer-events属性为auto展示出来。子菜单中的菜单项hover效果也通过transform属性实现。