更新第66个小实例
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DESKTOP-BM6RJU5\wyanh
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62. HTML5+CSS3小实例之流星划过天际的动画效果
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63. HTML5+CSS3小实例之纯CSS实现全屏滚动贴合效果（竖屏）
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64. HTML5+CSS3小实例之纯CSS实现全屏滚动贴合效果（横屏）
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65. HTML5+CSS3小实例之纯CSS实现点赞的动画效果
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65. HTML5+CSS3小实例之纯CSS实现点赞的动画效果
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66. HTML5+CSS3小实例之带缩略图的焦点图切换效果
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*{
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/* 初始化 */
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margin: 0;
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padding: 0;
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/* 盒子模型 改变盒子宽高的计算方式 */
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box-sizing: border-box;
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}
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body{
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/* 100%窗口高度 */
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height: 100vh;
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/* 弹性布局 水平+垂直居中 */
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display: flex;
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justify-content: center;
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align-items: center;
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/* 渐变背景 */
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background: linear-gradient(to bottom,#517fa4,#243949);
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}
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.container{
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width: 1000px;
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height: 700px;
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}
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.container ul{
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list-style: none;
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/* 相对定位 */
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position: relative;
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width: 100%;
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height: 100%;
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/* 弹性布局 */
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display: flex;
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/* 让子元素平均分配宽度 */
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justify-content: space-around;
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/* 让子元素在交叉轴（Y轴）的最下方排列 */
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align-items: flex-end;
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}
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.container ul li{
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width: 200px;
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cursor: pointer;
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}
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/* 小图 */
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.container ul li img{
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width: 100%;
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height: 110px;
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/* 加个透明边框，让图片看起来有距离 */
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border: 5px solid transparent;
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}
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/* 大图 */
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.container ul .big-img{
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/* 绝对定位 */
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position: absolute;
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top: 0;
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left: 0;
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width: 1000px;
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height: 550px;
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/* 背景图片 不平铺 */
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background: url("../images/op1/1.jpg") no-repeat;
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/* 对图片进行剪切，保留原始比例 */
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background-size: cover;
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/* 图片定位正中间 */
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background-position: center;
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/* 和小图片一样的透明边框，为了对齐 */
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border: 5px solid transparent;
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/* 动画过渡 */
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transition: 0.5s;
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}
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/* 移动框 */
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.container ul .frame{
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position: absolute;
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left: 0;
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bottom: 4px;
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width: 200px;
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height: 110px;
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border: 5px solid #fff;
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/* 这里有一个bug（闪烁） */
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/* 加这个属性可以让移动框不会被鼠标捕捉到（解决闪烁这个bug） */
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pointer-events: none;
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/* 加个动画过渡 */
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transition: 0.5s;
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}
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/* 移动框上的三角形 */
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.container ul .frame::before{
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content: "";
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position: absolute;
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width: 30px;
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height: 15px;
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background-color: #fff;
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/* 计算 居中 */
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left: calc(50% - 15px);
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top: -18px;
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/* 裁切出一个三角形 */
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clip-path: polygon(0 100%,50% 0,100% 100%);
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}
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/* 鼠标移入小图，改变大图 */
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.container ul li:nth-child(1):hover ~ .big-img{
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background-image: url("../images/op1/1.jpg");
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}
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.container ul li:nth-child(2):hover ~ .big-img{
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background-image: url("../images/op1/2.jpg");
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}
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.container ul li:nth-child(3):hover ~ .big-img{
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background-image: url("../images/op1/3.jpg");
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}
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.container ul li:nth-child(4):hover ~ .big-img{
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background-image: url("../images/op1/4.jpg");
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}
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.container ul li:nth-child(5):hover ~ .big-img{
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background-image: url("../images/op1/5.jpg");
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}
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/* 鼠标移入小图，改变移动框的位置 */
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.container ul li:nth-child(1):hover ~ .frame{
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left: 0;
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}
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.container ul li:nth-child(2):hover ~ .frame{
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left: 200px;
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}
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.container ul li:nth-child(3):hover ~ .frame{
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left: 400px;
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}
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.container ul li:nth-child(4):hover ~ .frame{
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left: 600px;
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}
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.container ul li:nth-child(5):hover ~ .frame{
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left: 800px;
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}
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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
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<title>带缩略图的焦点图切换效果</title>
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<link rel="stylesheet" href="../css/66.css">
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</head>
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<body>
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<div class="container">
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<ul>
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<li><img src="../images/op1/1.jpg" alt=""></li>
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<li><img src="../images/op1/2.jpg" alt=""></li>
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<li><img src="../images/op1/3.jpg" alt=""></li>
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<li><img src="../images/op1/4.jpg" alt=""></li>
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<li><img src="../images/op1/5.jpg" alt=""></li>
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<li class="big-img"></li>
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<li class="frame"></li>
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</ul>
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</div>
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</body>
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</html>
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