【纯CSS3-animation】实现背景动态切换

声明：欢迎转载，但请注明由林立镇创作

image.png

github案例
源码

通过CSS3新属性实现

1. animation，@keyframes实现滑动，旋转，放大缩小动画
2. nth-of-type，更方便的操作元素
3. backgorund，控制图片覆盖方式，位置，覆盖区域，是否跟随文档
4. Flex，实现布局：居中，填充，横向排列
5. :target伪类，当点击文字时，切换背景图片的操作

HTML文件

    
    
    
    
    



    

        

            
这是我的两把枪
一把叫“射!”，另一把叫“啊!”
怎么样，喜欢么?
            
我是该让你们的心跳加快呢，还是，让它们停止！
            
想要再来一发么？我可不会留下任何悬念!
            
我没开玩笑，把那个苹果放到头上去!我瞄得很稳,正对眉心!
            
我在为我的激光充能!照亮所有敌人……驱逐所有暗影……点亮他们!
        
    
       ![](bg1.jpg)
       ![](bg2.jpg)
       ![](bg3.jpg)
       ![](bg4.jpg)
       ![](bg5.jpg)

CSS文件

*,*::after{
    box-sizing:border-box;//使用border-box盒子模型
    margin: 0;
    padding: 0;
}

html,body{
    height:100%;
    background:url(bg.jpg);
    background-size:cover;//实现背景图片的完全覆盖

}
.bg{
    min-height: 100vh;
    min-width: 100vw;
    width: 100%;
    position: fixed;
    top: 0;
    left: -100vw;
    z-index:1;
}


.slider{
    width:1024px;
    position:absolute;
    top:0;
    left:50%;
    z-index:9999;
    margin-top:250px;
    margin-left: -512px;
    
}
.slider>ul{
    display: flex;
    text-align: center;
}
.slider li{
    flex: 1 0;
    list-style: none;
    
    display: flex;
    flex-direction: column;
    margin:0 7px;
    align-items: center;
}
/*背景缩略图*/
.slider li::before{
    position: absolute;
    top:50px;
    z-index: 9999;
    content:"";
    display:block; 
    width:150px;
    height: 150px;
    border-radius: 50%;
    border: 5px solid #fff;
    //缩略图设置
   background-size: cover;
   background-repeat: no-repeat;
   background-attachment: scroll;
   background-clip: border-box;
   background-color: transparent;
   background-origin: padding-box;
}
.slider li:nth-of-type(1)::before{
    background-image: url(./bg1.jpg);
    background-position: center;//背景缩略图位置设置
}
.slider li:nth-of-type(2)::before{

    background-image: url(./bg2.jpg);
    background-position: right center;
   
}
.slider li:nth-of-type(3)::before{
   background-image: url(./bg3.jpg);
   background-position: right center;
}
.slider li:nth-of-type(4)::before{
    background-image: url(./bg4.jpg);
   background-position: right center;
}
.slider li:nth-of-type(5)::before{
    background-image: url(./bg5.jpg);
   background-position: right center;
}
/*背景缩略图，文本介绍*/
.slider li>a{
    margin-top:150px;
    flex-grow: 1;
    cursor: pointer;//鼠标样式
    text-decoration: none;
    color: white;
    font-weight: normal;
    font-family: cursive,fantasy ;
    text-shadow: -1px -1px 1px rgba(0, 0, 0, 0.8),
    -2px -2px 1px rgba(0, 0, 0, 0.3),
    -3px -3px 1px rgba(0, 0, 0, 0.3);
    padding-top: 70px;
    padding-bottom: 20px;
    border:2px solid #fff;
    border-radius: 5px;
}
.slider li:nth-of-type(1)>a{
    background-color: #02646e;
}
.slider li:nth-of-type(2) a{
    background-color: #eb0837;
}
.slider li:nth-of-type(3) a{
    background-color: #67b374;
}
.slider li:nth-of-type(4) a{
    background-color: #e6674a;
}
.slider li:nth-of-type(5) a{
    background-color: #e61061;
}

@keyframes leftSlide{
    0% {top:0;left: -100vw;}
    50% {top:0;left: 20vh;}
    100% {top:0;left: 0;}
}
.leftSlide:target {
    animation-name: leftSlide;
    animation-duration: 2s;
    animation-iteration-count: 1;
    animation-fill-mode:forwards;
}

@keyframes slideBottom {
    0% { top: 100vh;left:0; }
    50% { top: -20vh;left:0;}
    100% { top: 0;left:0;}
}
.bottomSlide:target{
    z-index: 100;
    animation-name: slideBottom;
    animation-duration: 2s;
    animation-iteration-count: 1;
    animation-fill-mode:forwards;                
}

@keyframes zoomIn {
    0% { top: 0;left:0;transform: scale(0.1); }
    50% { top: 0;left:0;transform: scale(2); }
    100%{top: 0;left:0;transform: scale(1);}
}
.zoomIn:target{
    z-index: 100;
    animation-name: zoomIn;
    animation-duration: 2s;
    animation-iteration-count: 1; 
    animation-fill-mode:forwards;                 
}
@keyframes zoomOut {
    0% { top: 0;left:0;transform: scale(2); }
    50% { top: 0;left:0;transform: scale(0.5); }
    100%{top: 0;left:0;transform: scale(1);}
}
.zoomOut:target{
    z-index: 100;
    animation-name: zoomOut;
    animation-duration: 2s;
    animation-iteration-count: 1;     
    animation-fill-mode:forwards; 
}
@keyframes rotate {
    0% { top: 0;left:0;transform: rotate(-360deg) scale(0.1);}
    100% { top: 0;left:0;transform: rotate(360deg) scale(1);}
}
.rotate:target{
    z-index: 100;
    animation-name: rotate;
    animation-duration: 2s;
    animation-iteration-count: 1;     
    animation-fill-mode:forwards; 
}