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css3实现摇动效果的下拉菜单(1+X Web前端开发 例题)

yeamy 2022-04-21 阅读 52
css3html

<!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);
}
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