微信小程序 抽奖

废话不多说，直接上图

1.wxml

			
				
			  		{{item.award}}
				
			
		
  
		抽奖		
	

2.js

Page({

  //奖品配置
  awardsConfig: {
    chance: true,
    awards: [
      { 'index': 0, 'name': '谢谢合作' },
      { 'index': 1, 'name': '电脑' },
      { 'index': 2, 'name': 'iPhoneX' },
      { 'index': 3, 'name': '电视机' },
      { 'index': 4, 'name': '冰箱' },
      { 'index': 5, 'name': '彩电' }
    ]
  },

  data: {
    awardsList: {},
    animationData: {},
    btnDisabled: '',
  },

  onReady: function (e) {
    this.drawAwardRoundel();

    //分享
    wx.showShareMenu({
      withShareTicket: true
    });
  },

  //画抽奖圆盘
  drawAwardRoundel: function () {
    var awards = this.awardsConfig.awards;
    var awardsList = [];
    var turnNum = 1 / awards.length;  // 文字旋转 turn 值

    // 奖项列表
    for (var i = 0; i < awards.length; i++) {
      awardsList.push({ turn: i * turnNum + 'turn', lineTurn: i * turnNum + turnNum / 2 + 'turn', award: awards[i].name });
    }

    this.setData({
      btnDisabled: this.awardsConfig.chance ? '' : 'disabled',
      awardsList: awardsList
    });
  },

  //发起抽奖
  playReward: function () {
    //中奖index
    var awardIndex = Math.floor(Math.random()*6);
    console.log(awardIndex);
    var runNum = 8;//旋转8周
    var duration = 4000;//时长

    // 旋转角度
    this.runDeg = this.runDeg || 0;
    this.runDeg = this.runDeg + (360 - this.runDeg % 360) + (360 * runNum - awardIndex * (360 / 6))
    //创建动画
    var animationRun = wx.createAnimation({
      duration: duration,
      timingFunction: 'ease'
    })
    animationRun.rotate(this.runDeg).step();
    this.setData({
      animationData: animationRun.export(),
      btnDisabled: 'disabled'
    });

    // 中奖提示
    var awardsConfig = this.awardsConfig;
    setTimeout(function () {
      wx.showModal({
        title: '恭喜',
        content: '获得' + (awardsConfig.awards[awardIndex].name),
        showCancel: false
      });
      this.setData({
        btnDisabled: ''    //是否重复抽取
      });
    }.bind(this), duration);

  },

  onShareAppMessage: function () {
    var that = this;
    return util.doShare("大转盘抽奖", "pages/zp/zp", that);
  }

})

3.WXSS

/* pages/zp/zp.wxss */
page {
  /* background: rgb(13, 255, 255); */
  background-image: url("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1547284738960&di=1ba875a76061b51922017354527fe545&imgtype=0&src=http%3A%2F%2Fimg.mp.itc.cn%2Fupload%2F20161227%2Fd4f67ef183f44d71ab50dd6c89976ff2_th.jpg");
}

/* 转盘 */
.canvas-container {
  margin: 0 auto;
  position: relative;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  box-shadow: 0 2px 3px #333, 0 0 2px #000;
}
.canvas-content {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  display: block;
  width: 300px;
  height: 300px;
  border-radius: inherit;
  background-clip: padding-box;
  background-color: #ffcb3f;
}
.canvas-element {
  position: relative;
  z-index: 1;
  width: inherit;
  height: inherit;
  border-radius: 50%;
}
.canvas-list {
  position: absolute;
  left: 0;
  top: 0;
  width: inherit;
  height: inherit;
  z-index: 9999;
}
.canvas-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);
}
.canvas-item-text {
  position: relative;
  display: block;
  padding-top: 20px;
  margin: 0 auto;
  text-align: center;
  -webkit-transform-origin: 50% 150px;
  transform-origin: 50% 150px;
}

/* 分隔线 */
.canvas-line {
  position: absolute;
  left: 0;
  top: 0;
  width: inherit;
  height: inherit;
  z-index: 99;
}
.canvas-litem {
  position: absolute;
  left: 150px;
  top: 0;
  width: 1px;
  height: 150px;
  background-color: rgba(228, 55, 14, 0.4);
  overflow: hidden;
  -webkit-transform-origin: 50% 150px;
  transform-origin: 50% 150px;
}

/**
* 抽奖按钮
*/
.canvas-btn {
  position: absolute;
  left: 110px;
  top: 110px;
  z-index: 400;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  color: #f4e9cc;
  background-color: #e44025;
  line-height: 80px;
  text-align: center;
  font-size: 20px;
  text-shadow: 0 -1px 1px rgba(0, 0, 0, 0.6);
  box-shadow: 0 3px 5px rgba(0, 0, 0, 0.6);
  text-decoration: none;
}
.canvas-btn::after {
  position: absolute;
  display: block;
  content: ' ';
  left: 10px;
  top: -46px;
  width: 0;
  height: 0;
  overflow: hidden;
  border-width: 30px;
  border-style: solid;
  border-color: transparent;
  border-bottom-color: #e44025;
}
.canvas-btn.disabled {
  pointer-events: none;
  background: #b07a7b;
  color: #ccc;
}
.canvas-btn.disabled::after {
  border-bottom-color: #b07a7b;
}