今天给大家带来自动轮播的multi-flip动画，o(^▽^)o，不知道什么是multi-flip没关系，来张效果图就懂了->
multi-flip2.gif
1.总体思路有正面7个div，背面7个div，重叠在一起，正面一张图片，背面另外一张图片（如一张纸的正反面画着不同的图画），正面旋转180度后显示背面的图片，并将原本正面div的图片替换成原本背面的div的图片，背面旋转180度，显示正面（此时回到最初的位置状态），一直循环。简单来说：正面div旋转，替换，转回，背面div替换成下张图片，以此一直循环下去。（单纯看文字有点难以理解，我们直接来看看“庐山真面目”）2.HTML：先看html，有个整体了解。
<body> <div class="outer_box"> <div id="d0" class="inner_div"> <div class="bcwd"></div><!--背面的div--> <div class="fwd"></div><!--正面的div--> </div> <div id="d1" class="inner_div"> <div class="bcwd"></div> <div class="fwd"></div> </div> <!--此处省略div id="d2"-"d5"的书写（代码相同）--> <div id="d6" class="inner_div"> <div class="bcwd"></div> <div class="fwd"></div> </div> </div> </body>
3.CSS：切分图片：将一张完整的图切成7块，各自进行不同的动画。在没有切图的情况下，如何让图片分成7块：设置7个div，每个div宽度为图片的1/7，position：absolute，且每个div的backgroundPosition的x值由0逐渐递减1/7.
64LL4E2OL83]ED{]CQ6I0`J.png
（图中蓝色部分为背景图，每个div都插入同一背景图，通过设置backgroundPosition，让图片沿X轴左移，即可7个div都显示对应的部分，构成完整的一张图）
关键样式：
.bcwd{ background: url(../img/sample2.jpg) no-repeat; background-size: 600px 400px; /*背面的图片默认状态，背对正面，且上下颠倒（使选装之后上下不颠倒）*/ -webkit-transform: rotateY(180deg) rotateZ(180deg); }.fwd{ position: absolute; top: 0; background: url(../img/sample1.jpg) no-repeat; background-size: 600px 400px;} 解释一下第五行中的这行代码：-webkit-transform: rotateY(180deg) rotateZ(180deg);如果只是在fwd和bcwd div绘制图片，会在图中的面1、3分别显示图片1、2，但正确的应是面1为正面（图1），面2、3紧贴一起，面4为背面（图2），这样才可以做到正面div向前旋转180度后背面成为正面，且背面图片是正的。为实现上述效果，bcwd div就要沿Y轴旋转180度，变成面4显示图片，再沿Z轴旋转180度，是背面图片旋转为正面时，图片不是倒过来的。
2.png
js设置样式：
var bcwd = document.getElementsByClassName('bcwd'); var fwd = document.getElementsByClassName('fwd'); for (var i = 0; i < inner.length; i++) { //设置bcwd和back的位置（left background-position） bcwd[i].style.left = 85.72 * i + 'px'; bcwd[i].style.backgroundPosition = '-' + 85.72 * i + 'px 0'; fwd[i].style.left = 85.72 * i + 'px'; fwd[i].style.backgroundPosition = '-' + 85.72 * i + 'px 0'; } 4.JS：实现动画间隔一段时间后正面转向背面，再间隔一段时间后，背面转为正面。
.inner_div.r{ -webkit-transform: rotateX(180deg); /*正面转为背面，背面转为正面*/ -webkit-transition: -webkit-transform 1s ease-in-out;} setInterval(function(){ go(); },2000); var index = 2,nextIndex = 3; //用于计算第几张图片 inner[0].addEventListener("webkitTransitionEnd", function () { //换背景图（此时，fwd在背面。bcwd在正面） if(index == 4) nextIndex = 1; //最后一张图片与第一张图片的切换 else nextIndex = index + 1; for (var j = 0; j < fwd.length; j++) { //fwd的图片替换成当前图片 fwd[j].style.backgroundImage = 'url(img/sample' + index + '.jpg)'; } reset(); //fwd旋转为正面，bcwd旋转为背面 for (var j = 0; j < fwd.length; j++) { //bcwd的图片替换成下一张图片 bcwd[j].style.backgroundImage = 'url(img/sample' + nextIndex + '.jpg)'; } index = nextIndex; }); //实现背面转向正面 function go () { setTimeout(function() { inner[3].classList.add("r"); setTimeout(function() { inner[2].classList.add("r"); inner[4].classList.add("r"); setTimeout(function() { inner[1].classList.add("r"); inner[5].classList.add("r"); setTimeout(function() { inner[0].classList.add("r"); inner[6].classList.add("r"); }, 200); //时间可以改变，但是4个时间相加总和+动画旋转时间（css 1s）要小于上边setTimout的总时间 }, 200); }, 200); }, 200) }//实现正面转为背面 function reset () { for (var m = 0;m<inner.length;m++) { inner[m].classList.remove("r"); } } 目前效果：
multi-flip.gif
（是否感觉有一片一片的生硬感呢？）5.升华：添加以下2句CSS即可解决：
.outer_box{ -webkit-transform-style: preserve-3d; -webkit-perspective: 2000; /*增强3D效果*/} 6.补充：1.backface-visibility: visible|hidden;定义当元素不面向屏幕时是否可见。visible:背面是可见的。hidden:背面不可见的。2.以下两句很有用处，增强3D效果，大大提升动画效果啊！-webkit-transform-style: preserve-3d; -webkit-perspective: 2000;3.完整代码晚点揭晓。
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