<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>第二题-css3实现动画</title>
<link rel="stylesheet" href="css/index.css">
</head>
<body>
<div id="container">
<ul id="menu">
<li>
<a href="#">主菜单一</a>
<ul>
<li><a href="#">子菜单1-1</a></li>
<li><a href="#">子菜单1-2</a></li>
<li><a href="#">子菜单1-3</a></li>
</ul>
</li>
<li>
<a href="#">主菜单二</a>
<ul>
<li><a href="#">子菜单2-1</a></li>
<li><a href="#">子菜单2-2</a></li>
<li><a href="#">子菜单2-3</a></li>
<li><a href="#">子菜单2-4</a></li>
<li><a href="#">子菜单2-5</a></li>
<li><a href="#">子菜单2-6</a></li>
</ul>
</li>
<li>
<a href="#">主菜单三</a>
<ul>
<li><a href="#">子菜单3-1</a></li>
<li><a href="#">子菜单3-2</a></li>
<li><a href="#">子菜单3-3</a></li>
</ul>
</li>
<li>
<a href="#">主菜单四</a>
<ul>
<li><a href="#">子菜单4-1</a></li>
<li><a href="#">子菜单4-2</a></li>
<li><a href="#">子菜单4-3</a></li>
</ul>
</li>
</ul>
</div>
</body>
</html>
* {
margin: 0;
padding: 0;
list-style-type:none;
}
body {
padding: 30px;
font-family: "Helvetica Neue", helvetica, arial;
background: url('http://subtlepatterns.com/patterns/white_carbonfiber.png');
}
#container {
position: relative;
width: 940px;
}
#container:after {
content: "";
display: block;
clear: both;
height: 0;
}
#menu {
position: relative;
float: left;
width: 100%;
padding: 0 20px;
border-radius: 3px;
/* 设置盒子阴影 */
/* ____(1)_____: inset 0 1px 1px rgba(255,255,255,.5), inset 0 -1px 0 rgba(0,0,0,.15), 0 1px 3px rgba(0,0,0,.15); */
box-shadow: inset 0 1px 1px rgba(255,255,255,.5), inset 0 -1px 0 rgba(0,0,0,.15), 0 1px 3px rgba(0,0,0,.15);
background: #ccc;
}
#menu, #menu ul {
list-style: none;
}
#menu > li {
float: left;
position: relative;
border-right: 1px solid rgba(0,0,0,.1);
/* ____(1)____: 1px 0 0 rgba(255,255,255,.25); */
box-shadow: 1px 0 0 rgba(255,255,255,.25);
/* ____(2)____: 1000px; */
}
/*设置第一个li元素*/
/* #menu > li__(3)_____ { */
#menu > li:first-child {
border-left: 1px solid rgba(255,255,255,.25);
/* ____(1)____: -1px 0 0 rgba(0,0,0,.1), 1px 0 0 rgba(255,255,255,.25); */
box-shadow: -1px 0 0 rgba(0,0,0,.1), 1px 0 0 rgba(255,255,255,.25);
}
#menu li li{float:left;}
#menu a {
display: block;
float:left;
position: relative;
/* ____(4)_____:10;设置层级为10 */
z-index: 10;/*设置层级为10*/
padding: 13px 20px 13px 20px;
text-decoration: none;
color: rgba(75,75,75,1);
line-height: 1;
font-weight: 600;
font-size: 12px;
/* _____(5)____: -.05em;设置字符间距 */
letter-spacing: -.05em;/*设置字符间距*/
background: transparent;
/* ____(6)_____: 0 1px 1px rgba(255,255,255,.9);设置文字投影 */
text-shadow: 0 1px 1px rgba(255,255,255,.9);/*设置文字投影*/
transition: all .25s ease-in-out;
}
#menu > li:hover > a {
background: #333;
color: rgba(0,223,252,1);
/* _____(6)___: none;取消文字投影 */
text-shadow: none;
}
#menu li ul {
position: absolute;
top:38px;
left: 0;
/* ____(4)____: 1;设置层级 */
z-index: 1;/*设置层级*/
width: 200px;
padding: 0;
opacity: 0;
visibility: hidden;
border-bottom-left-radius: 4px;
border-bottom-right-radius: 4px;
background: transparent;
overflow: hidden;
/* _____(7)____: 50% 0%;设置旋转元素的基点位置 */
transform-origin: 50% 0%;/*设置旋转元素的基点位置*/
}
#menu li:hover ul {
padding: 15px 0;
background: #333;
opacity: 1;
visibility: visible;
/* ___(1)____: 1px 1px 7px rgba(0,0,0,.5); */
box-shadow: 1px 1px 7px rgba(0,0,0,.5);
animation-name: swingdown;
/* _____(8)_____: 1s;设置动画执行时间 */
animation-duration: 1s;/*设置动画执行时间*/
animation-timing-function: ease;
}
/*定义动画*/
/* ____(9)_____ swingdown { */
@keyframes swingdown {
0% {
opacity: .99999;
/* ____(10)____: rotateX(90deg); */
transform: rotateX(90deg);
}
30% {
/* ____(10)____: rotateX(-20deg) rotateY(5deg); */
transform: rotateX(-20deg) rotateY(5deg);
animation-timing-function: ease-in-out;
}
65% {
/* ____(10)____: rotateX(20deg) rotateY(-3deg); */
transform: rotateX(20deg) rotateY(-3deg);
animation-timing-function: ease-in-out;
}
100% {
/* ____(10)____: rotateX(0); */
transform: rotateX(0);
animation-timing-function: ease-in-out;
}
}
#menu li li a {
padding-left: 15px;
font-weight: 400;
color: #ddd;
text-shadow: none;
border-top: dotted 1px transparent;
border-bottom: dotted 1px transparent;
transition: all .15s linear;
}
#menu li li a:hover {
color: rgba(0,223,252,1);
border-top: dotted 1px rgba(255,255,255,.15);
border-bottom: dotted 1px rgba(255,255,255,.15);
background: rgba(0,223,252,.02);
}