CSS3 3D变换之综合运用
先上效果图吧
点击'roll'按钮，会出现旋转的动画
代码如下
<!DOCTYPE html><html><head> <title></title> <script type="text/javascript" src="JS/jquery-1.12.2.min.js"></script> <style type="text/css"> div#camera{ width: 500px; height: 500px; outline: 1px solid black; margin:100px auto; position: relative; perspective: 1000px; } div#camera>div{ width: 400px; height: 400px; position: absolute; top:calc(50% - 200px); left:calc(50% - 200px); outline: 1px solid black; transition: all 1s linear; background-color: #fff; } div#camera>div:nth-child(1){ transform: rotateY(0deg) translateZ(200px); z-index: 99; } div#camera>div:nth-child(2){ transform: rotateY(90deg) translateZ(200px); } div#camera>div:nth-child(3){ transform: rotateY(180deg) translateZ(200px); } div#camera>div:nth-child(4){ transform: rotateY(270deg) translateZ(200px); } div#camera>div>img{ width: 100%; } button{ margin: 10px auto; display: block; } </style></head><body> <div id="camera"> <div><img src="/static/imghw/default1.png" data-src="Img/102342_40949584.png" class="lazy"/ alt="CSS3 3D变换之综合运用" ></div> <div><img src="/static/imghw/default1.png" data-src="Img/102342_40949584.png" class="lazy"/ alt="CSS3 3D变换之综合运用" ></div> <div><img src="/static/imghw/default1.png" data-src="Img/102342_40949584.png" class="lazy"/ alt="CSS3 3D变换之综合运用" ></div> <div><img src="/static/imghw/default1.png" data-src="Img/102342_40949584.png" class="lazy"/ alt="CSS3 3D变换之综合运用" ></div> </div> <button value="roll">roll</button> <script type="text/javascript"> $(document).ready(function() { (function() { var count=0, reversedCount=4; var changeRotateY = function($ele, deg) { var index = $ele.index()+1+count; var deg = deg*index; $ele[0].setAttribute('style','transform:rotateY('+deg+'deg) translateZ(200px);') } $('button[value="roll"]').on('click', function() { $('div#camera>div').each(function() { changeRotateY($(this), 90); }); // changeRotateY($('div#camera>div:nth-child(1)'), 90); // changeRotateY($('div#camera>div:nth-child(2)'), 90); // changeRotateY($('div#camera>div:nth-child(3)'), 90); // changeRotateY($('div#camera>div:nth-child(4)'), 90); count++; reversedCount--; $('div#camera>div').eq(reversedCount%4).css({'z-index':'99'}).siblings().css({'z-index':'0'}); if(reversedCount==0){ reversedCount=4; } }); })(); }); </script></body></html>稍微解析一下：
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CSS部分用来生成静态的三维盒子，#camera下的四个子div分别旋转0°、90°、180°、270°后再以自身旋转后的坐标系为基准 translateZ(200px) ， 相当于四个子div分别向前（也就是正对屏幕的方向）、向右、向后（也就是背向屏幕的方向）、向左移动了200px，由于div本身的尺寸就是400px*400px， 因此做此变换后四个div就围成了一个立体的盒子。此时从上往下看，效果图如下：
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这里的 transform 的顺序很重要，如果是先 rotateY 再 translateZ , 那么 translateZ 是以rotate以后的坐标轴进行平移，这样才能达到前后左右平移的效果； 如果先 translateZ 再 rotateY , 那么所有元素都会先平移，然后在一个位置上进行旋转了！
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changeRotateY 函数用来改变div的旋转角度，根据该元素的 eq 和传入的 count 值(按钮被点击的次数)来设置元素的 rotateY 的值。由于 遇到了动态获取 transform 值的问题 这里的函数灵活性不高，有点遗憾。 第一次点击的时候， count 为0， index() 为0的元素的 rotateY 会从0°增加到90°， index() 为1的元素的 rotateY 会从90°增加到180°，and so on; 第二次点击， count 为1， 上述值会各增加90°，完成无限旋转的效果；
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遇到的一个很大的问题就是转到后面的元素依旧会显示出来。 试过 background-color 和 backface-visibility:hidden 都不怎么好用，尤其是 backface-visibility ， 转到90度的时候还是显示的，在90.01°时才会隐藏backface, 如果想用 backface-visibility 来隐藏后面元素的话得fine-tune, 还会引起稍微的错位问题，遂放弃；
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最后使用的是 z-index 来隐藏后面的元素， 动态设置转到最前面的元素的 z-index 为较大值。注意 z-index 属性不对 position 为 static 的元素起作用。 当然我们这里的div们都是 absolute ，所以就能应用得很好啦~
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要显示的元素的 eq 值分别为3、2、1、0，当然直接用递增的 count 变量+ switch / if else 语句也能做，但陡减可读性； 取而代之的是增加了一个递减的 reversedCount 变量，它来负责匹配每次要设置 z-index 的元素。
欢迎转载，请注明出处。
参考资料： 玩轉 CSS 3D - 原理篇
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