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CSS3動(dòng)畫（3）：transform實(shí)現(xiàn)multi-flip動(dòng)畫_html/css_WEB-ITnose
CSS3動(dòng)畫（3）：transform實(shí)現(xiàn)multi-flip動(dòng)畫_html/css_WEB-ITnose
Jun 21, 2016 am 08:46 AM
今天給大家?guī)碜詣?dòng)輪播的multi-flip動(dòng)畫，o(^▽^)o，不知道什么是multi-flip沒關(guān)系，來張效果圖就懂了->
multi-flip2.gif
1.總體思路有正面7個(gè)div，背面7個(gè)div，重疊在一起，正面一張圖片，背面另外一張圖片（如一張紙的正反面畫著不同的圖畫），正面旋轉(zhuǎn)180度后顯示背面的圖片，并將原本正面div的圖片替換成原本背面的div的圖片，背面旋轉(zhuǎn)180度，顯示正面（此時(shí)回到最初的位置狀態(tài)），一直循環(huán)。簡單來說：正面div旋轉(zhuǎn)，替換，轉(zhuǎn)回，背面div替換成下張圖片，以此一直循環(huán)下去。（單純看文字有點(diǎn)難以理解，我們直接來看看“廬山真面目”）2.HTML：先看html，有個(gè)整體了解。
<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> <!--此處省略div id="d2"-"d5"的書寫（代碼相同）--> <div id="d6" class="inner_div"> <div class="bcwd"></div> <div class="fwd"></div> </div> </div> </body>
3.CSS：切分圖片：將一張完整的圖切成7塊，各自進(jìn)行不同的動(dòng)畫。在沒有切圖的情況下，如何讓圖片分成7塊：設(shè)置7個(gè)div，每個(gè)div寬度為圖片的1/7，position：absolute，且每個(gè)div的backgroundPosition的x值由0逐漸遞減1/7.
64LL4E2OL83]ED{]CQ6I0`J.png
（圖中藍(lán)色部分為背景圖，每個(gè)div都插入同一背景圖，通過設(shè)置backgroundPosition，讓圖片沿X軸左移，即可7個(gè)div都顯示對(duì)應(yīng)的部分，構(gòu)成完整的一張圖）
關(guān)鍵樣式：
.bcwd{ background: url(../img/sample2.jpg) no-repeat; background-size: 600px 400px; /*背面的圖片默認(rèn)狀態(tài)，背對(duì)正面，且上下顛倒（使選裝之后上下不顛倒）*/ -webkit-transform: rotateY(180deg) rotateZ(180deg); }.fwd{ position: absolute; top: 0; background: url(../img/sample1.jpg) no-repeat; background-size: 600px 400px;} 解釋一下第五行中的這行代碼：-webkit-transform: rotateY(180deg) rotateZ(180deg);如果只是在fwd和bcwd div繪制圖片，會(huì)在圖中的面1、3分別顯示圖片1、2，但正確的應(yīng)是面1為正面（圖1），面2、3緊貼一起，面4為背面（圖2），這樣才可以做到正面div向前旋轉(zhuǎn)180度后背面成為正面，且背面圖片是正的。為實(shí)現(xiàn)上述效果，bcwd div就要沿Y軸旋轉(zhuǎn)180度，變成面4顯示圖片，再沿Z軸旋轉(zhuǎn)180度，是背面圖片旋轉(zhuǎn)為正面時(shí)，圖片不是倒過來的。
2.png
js設(shè)置樣式：
var bcwd = document.getElementsByClassName('bcwd'); var fwd = document.getElementsByClassName('fwd'); for (var i = 0; i < inner.length; i++) { //設(shè)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：實(shí)現(xiàn)動(dòng)畫間隔一段時(shí)間后正面轉(zhuǎn)向背面，再間隔一段時(shí)間后，背面轉(zhuǎn)為正面。
.inner_div.r{ -webkit-transform: rotateX(180deg); /*正面轉(zhuǎn)為背面，背面轉(zhuǎn)為正面*/ -webkit-transition: -webkit-transform 1s ease-in-out;} setInterval(function(){ go(); },2000); var index = 2,nextIndex = 3; //用于計(jì)算第幾張圖片 inner[0].addEventListener("webkitTransitionEnd", function () { //換背景圖（此時(shí)，fwd在背面。bcwd在正面） if(index == 4) nextIndex = 1; //最后一張圖片與第一張圖片的切換 else nextIndex = index + 1; for (var j = 0; j < fwd.length; j++) { //fwd的圖片替換成當(dāng)前圖片 fwd[j].style.backgroundImage = 'url(img/sample' + index + '.jpg)'; } reset(); //fwd旋轉(zhuǎn)為正面，bcwd旋轉(zhuǎn)為背面 for (var j = 0; j < fwd.length; j++) { //bcwd的圖片替換成下一張圖片 bcwd[j].style.backgroundImage = 'url(img/sample' + nextIndex + '.jpg)'; } index = nextIndex; }); //實(shí)現(xiàn)背面轉(zhuǎn)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); //時(shí)間可以改變，但是4個(gè)時(shí)間相加總和+動(dòng)畫旋轉(zhuǎn)時(shí)間（css 1s）要小于上邊setTimout的總時(shí)間 }, 200); }, 200); }, 200) }//實(shí)現(xiàn)正面轉(zhuǎn)為背面 function reset () { for (var m = 0;m<inner.length;m++) { inner[m].classList.remove("r"); } } 目前效果：
multi-flip.gif
（是否感覺有一片一片的生硬感呢？）5.升華：添加以下2句CSS即可解決：
.outer_box{ -webkit-transform-style: preserve-3d; -webkit-perspective: 2000; /*增強(qiáng)3D效果*/} 6.補(bǔ)充：1.backface-visibility: visible|hidden;定義當(dāng)元素不面向屏幕時(shí)是否可見。visible:背面是可見的。hidden:背面不可見的。2.以下兩句很有用處，增強(qiáng)3D效果，大大提升動(dòng)畫效果??！-webkit-transform-style: preserve-3d; -webkit-perspective: 2000;3.完整代碼晚點(diǎn)揭曉。
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