CSS3做出響應式、可配置的抽獎轉盤

這次給大家帶來CSS3做出響應式、可配置的抽獎轉盤，CSS3做出響應式、可配置的抽獎轉盤的注意事項有哪些，下面就是實戰案例，一起來看一下。

源於前段時候小程式最初火爆公測時段，把以前用 Canvas 實現的大轉盤抽獎移植成小程式，無奈當時小程式對 Canvas 支援不夠完善，只好降低用 CSS3 實現。雖然比不上 Canvas 繪圖的絢麗，但也總算完成了一個抽獎的 Demo，詳見：http://xiazai.jb51.net/201701/yuanma/wechat-canvas_jb51.rar

事後想起，CSS3 實現也並不是無有益處，比如簡單、快捷、調試方便、渲染想來也是要比 Canvas 要高效的，更重要的一點是支援媒體查詢，大轉盤也可以做成響應式的。因此抽空整理，用純 CSS3 實現一個大轉盤抽獎 Demo 並記錄下來。

如果有類似需求並不想麻煩瞭解細節，可移步這裡——Canvas 完整的大轉盤抽獎項目（可以直接拿來用）http://xiazai.jb51.net/201701/yuanma/canvas_jb51.rar

以下就直接貼代碼了。

代碼

HTML

<section class="gb-wheel-container" id="gbWheel">    <p class="gb-wheel-content gb-wheel-run">        <ul class="gb-wheel-line"></ul>        <p class="gb-wheel-list"></p>    </p>    <a href="javascript:;" class="gb-wheel-btn" id="gbLottery">抽獎</a>     </section>

JS

(function() {    // 獎品配置    var awards = [            {'index': 0, 'text': '耳機' , 'name': 'icono-headphone'},            {'index': 1, 'text': 'iPhone' , 'name': 'icono-iphone'},            {'index': 2, 'text': '相機' , 'name': 'icono-camera'},            {'index': 3, 'text': '咖啡杯' , 'name': 'icono-cup'},            {'index': 4, 'text': '日曆', 'name': 'icono-calendar'},            {'index': 5, 'text': '鍵盤', 'name': 'icono-keyboard'}        ],        len = awards.length,        turnNum = 1 / len;  // 文字旋轉 turn 值    var gbWheel = $('gbWheel'),        lineList = gbWheel.querySelector('ul.gb-wheel-line'),        itemList = gbWheel.querySelector('.gb-wheel-list'),        lineListHtml = [],        itemListHtml = [];    var transform = preTransform();    awards.forEach(function(v, i, a) {        // 分隔線        lineListHtml.push('<li class="gb-wheel-litem" style="' + transform + ': rotate('+ (i * turnNum + turnNum / 2) +'turn)"></li>');        // 獎項        itemListHtml.push('<p class="gb-wheel-item">');        itemListHtml.push('<p class="gb-wheel-icontent" style="' + transform + ': rotate('+ (i * turnNum) +'turn)">');        itemListHtml.push('<p class="gb-wheel-iicon">');        itemListHtml.push('<i class="'+v.name+'"></i>');        itemListHtml.push('</p>');        itemListHtml.push('<p class="gb-wheel-itext">');        itemListHtml.push(v.text);        itemListHtml.push('</p>');        itemListHtml.push('</p>');        itemListHtml.push('</p>');    });               lineList.innerHTML = lineListHtml.join('');    itemList.innerHTML = itemListHtml.join('');    function $(id) {        return document.getElementById(id);    };    // 旋轉    var i = 0;    $('gbLottery').onclick = function() {        i++;        gbWheel.querySelector('.gb-wheel-content').style = transform + ': rotate('+ i * 3600 +'deg)';      }    // transform相容    function preTransform() {        var cssPrefix,        vendors = {          '': '',          Webkit: 'webkit',          Moz: '',          O: 'o',          ms: 'ms'        },        testEle = document.createElement('p'),        cssSupport = {};         // 嗅探特性        Object.keys(vendors).some(function(vendor) {            if (testEle.style[vendor + (vendor ? 'T' : 't') + 'ransform'] !== undefined) {              cssPrefix = vendor ? '-' + vendor.toLowerCase() + '-' : '';              return true;            }        });      function normalizeCss(name) {        name = name.toLowerCase();        return cssPrefix ? cssPrefix + name : name;      }      cssSupport = {        transform: normalizeCss('Transform'),      }      return cssSupport.transform;    }}());

CSS

html {    font-size: 10px}.gb-wheel-container ul,.gb-wheel-container li,.gb-wheel-container p {    margin: 0;    padding: 0}.gb-wheel-container ul,.gb-wheel-container li {    list-style: none}.gb-wheel-container {    margin: 0 auto;    position: relative;    width: 30rem;    height: 30rem;    border-radius: 50%;    box-shadow: 0 2px 3px #333, 0 0 2px #000;    overflow: hidden}.gb-wheel-content {    position: absolute;    left: 1rem;    top: 1rem;    z-index: 2;    width: 28rem;    height: 28rem;    box-sizing: border-box;    border-radius: inherit;    background-clip: padding-box;    background: -webkit-radial-gradient(rgba(100, 100, 100, 0.1) 15%, transparent 16%) 0 0,                  -webkit-radial-gradient(rgba(100, 100, 100, 0.1) 15%, transparent 16%) 8px 8px,    -webkit-radial-gradient(rgba(255, 255, 255, 0.1) 15%, transparent 20%) 0 1px,  -webkit-radial-gradient(rgba(255, 255, 255, 0.1) 15%, transparent 20%) 8px 9px;    background: radial-gradient(rgba(100, 100, 100, 0.1) 15%, transparent 16%) 0 0,                radial-gradient(rgba(100, 100, 100, 0.1) 15%, transparent 16%) 8px 8px,   radial-gradient(rgba(255, 255, 255, 0.1) 15%, transparent 20%) 0 1px,   radial-gradient(rgba(255, 255, 255, 0.1) 15%, transparent 20%) 8px 9px;    background-color: #ffcb3f;    background-size: 12px 14px}.gb-wheel-content:before {    content: ' ';    position: absolute;    left: -1rem;    top: -1rem;    z-index: -1;    width: 28rem;    height: 28rem;    border-radius: inherit;    border: 1rem solid #E44025;    box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.2) inset}.gb-wheel-list {    position: absolute;    left: 0;    top: 0;    width: inherit;    height: inherit;    z-index: 9999}.gb-wheel-item {    position: absolute;    left: 0;    top: 0;    width: 100%;    height: 100%;    color: #e4370e;    font-weight: bold;    text-shadow: 0 1px 1px rgba(255, 255, 255, 0.6)}.gb-wheel-icontent {    position: relative;    display: block;    padding-top: 1.5rem;    margin: 0 auto;    text-align: center;    -webkit-transform-origin: 50% 14rem;    -ms-transform-origin: 50% 14rem;    transform-origin: 50% 14rem}.gb-wheel-itext {    font-size: 1.4rem;    font-weight: lighter}.gb-wheel-iicon [class*=icono-] {    color: #e4370e}.gb-wheel-line {    position: absolute;    left: 0;    top: 0;    width: inherit;    height: inherit;    z-index: 99}.gb-wheel-litem {    position: absolute;    left: 14rem;    top: 0;    width: 1px;    height: 14rem;    background-color: rgba(228, 55, 14, 0.6);    overflow: hidden;    -webkit-transform-origin: 50% 14rem;    -ms-transform-origin: 50% 14rem;    transform-origin: 50% 14rem}.gb-wheel-btn {    position: absolute;    left: 11rem;    top: 11rem;    z-index: 400;    width: 8rem;    height: 8rem;    border-radius: 50%;    color: #F4E9CC;    background-color: #E44025;    line-height: 8rem;    text-align: center;    font-size: 2rem;    text-shadow: 0 -1px 1px rgba(0, 0, 0, 0.6);    box-shadow: 0 3px 5px rgba(0, 0, 0, 0.6), 0 0 5px 4px rgba(0, 0, 0, 0.2) inset;    text-decoration: none}a.gb-wheel-btn {    border-bottom: none}.gb-wheel-btn::after {    position: absolute;    content: '';    left: 2.5rem;    top: -1rem;    width: 3rem;    height: 3rem;    background-color: #E44025;    -webkit-transform: rotate(45deg);    -ms-transform: rotate(45deg);    transform: rotate(45deg);    box-shadow: 0 3px 5px rgba(0, 0, 0, 0.6), 0 0 5px 4px rgba(0, 0, 0, 0.2) inset}.gb-wheel-btn.disabled,.gb-wheel-btn.disabled::after {    pointer-events: none;    background: #B07A7B;    color: #ccc}.gb-wheel-run {    -webkit-transition: transform 6s ease;    transition: transform 6s ease}@media only screen and (min-width: 320px) {    html {        font-size: 10px    }}@media only screen and (min-width: 375px) {    html {        font-size: 11.71875px    }}@media only screen and (min-width: 480px) {    html {        font-size: 15px    }}

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