纯CSS3大转盘抽奖示例代码（响应式、可配置）

源于前段时候微信小程序最初火爆公测时段，把以前用 Canvas 实现的大转盘抽奖移植成微信小程序，无奈当时小程序对 Canvas 支持不够完善，只好降低用 CSS3 实现。虽然比不上 Canvas 绘图的绚丽，但也总算完成了一个抽奖的 Demo，详见：http://xiazai.jb51.net/201701/yuanma/wechat-canvas_jb51.rar

事后想起，CSS3 实现也并不是无有益处，比如简单、快捷、调试方便、渲染想来也是要比 Canvas 要高效的，更重要的一点是支持媒体查询，大转盘也可以做成响应式的。因此抽空整理，用纯 CSS3 实现一个大转盘抽奖 Demo 并记录下来。

如果有类似需求并不想麻烦了解细节，可移步这里——Canvas 完整的大转盘抽奖项目（可以直接拿来用）http://xiazai.jb51.net/201701/yuanma/canvas_jb51.rar

以下就直接贴代码了。

代码

HTML

    
 

 
    
    抽奖     

JS

(function() {
    // 奖品配置
    var awards = [
     {'index': 0, 'text': '耳机' , 'name': 'icono-headphone'},
     {'index': 1, 'text': 'iPhone' , 'name': 'icono-iphone'},
     {'index': 2, 'text': '相机' , 'name': 'icono-camera'},
     {'index': 3, 'text': '咖啡杯' , 'name': 'icono-cup'},
     {'index': 4, 'text': '日历', 'name': 'icono-calendar'},
     {'index': 5, 'text': '键盘', 'name': 'icono-keyboard'}
 ],
 len = awards.length,
 turnNum = 1 / len;  // 文字旋转 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) {
 // 分隔线
 lineListHtml.push('
');

 // 奖项
 itemListHtml.push('');
 itemListHtml.push('');
 itemListHtml.push('
');
 itemListHtml.push('');
 itemListHtml.push('
');
 itemListHtml.push('
');
 itemListHtml.push(v.text);
 itemListHtml.push('
');
 itemListHtml.push('');
 itemListHtml.push('');
    });    

    lineList.innerHTML = lineListHtml.join('');
    itemList.innerHTML = itemListHtml.join('');

    function $(id) {
 return document.getElementById(id);
    };

    // 旋转
    var i = 0;
    $('gbLottery').onclick = function() {
 i++;
 gbWheel.querySelector('.gb-wheel-content').style = transform + ': rotate('+ i * 3600 +'deg)';  
    }

    // transform兼容
    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
    }
}

项目

demo下载地址：demo

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