微信小程序 摇一摇抽奖简单实例实现代码

//index.js//获取应用实例var app = getApp()Page({ data: {  circleList: [],//圆点数组  awardList: [],//奖品数组  colorCircleFirst: '#FFDF2F',//圆点颜色1  colorCircleSecond: '#FE4D32',//圆点颜色2  colorAwardDefault: '#F5F0FC',//奖品默认颜色  colorAwardSelect: '#ffe400',//奖品选中颜色  indexSelect: 0,//被选中的奖品index  isRunning: false,//是否正在抽奖  imageAward: [   '../../images/1.jpg',   '../../images/2.jpg',   '../../images/3.jpg',   '../../images/4.jpg',   '../../images/5.jpg',   '../../images/6.jpg',   '../../images/7.jpg',   '../../images/8.jpg',  ],//奖品图片数组 }, onLoad: function () {  var _this = this;  //圆点设置  var leftCircle = 7.5;  var topCircle = 7.5;  var circleList = [];  for (var i = 0; i < 24; i++) {   if (i == 0) {    topCircle = 15;    leftCircle = 15;   } else if (i < 6) {    topCircle = 7.5;    leftCircle = leftCircle + 102.5;   } else if (i == 6) {    topCircle = 15    leftCircle = 620;   } else if (i < 12) {    topCircle = topCircle + 94;    leftCircle = 620;   } else if (i == 12) {    topCircle = 565;    leftCircle = 620;   } else if (i < 18) {    topCircle = 570;    leftCircle = leftCircle - 102.5;   } else if (i == 18) {    topCircle = 565;    leftCircle = 15;   } else if (i < 24) {    topCircle = topCircle - 94;    leftCircle = 7.5;   } else {    return   }   circleList.push({ topCircle: topCircle, leftCircle: leftCircle });  }  this.setData({   circleList: circleList  })  //圆点闪烁  setInterval(function () {   if (_this.data.colorCircleFirst == '#FFDF2F') {    _this.setData({     colorCircleFirst: '#FE4D32',     colorCircleSecond: '#FFDF2F',    })   } else {    _this.setData({     colorCircleFirst: '#FFDF2F',     colorCircleSecond: '#FE4D32',    })   }  }, 500)  //奖品item设置  var awardList = [];  //间距,怎么顺眼怎么设置吧.  var topAward = 25;  var leftAward = 25;  for (var j = 0; j < 8; j++) {   if (j == 0) {    topAward = 25;    leftAward = 25;   } else if (j < 3) {    topAward = topAward;    //166.6666是宽.15是间距.下同    leftAward = leftAward + 166.6666 + 15;   } else if (j < 5) {    leftAward = leftAward;    //150是高,15是间距,下同    topAward = topAward + 150 + 15;   } else if (j < 7) {    leftAward = leftAward - 166.6666 - 15;    topAward = topAward;   } else if (j < 8) {    leftAward = leftAward;    topAward = topAward - 150 - 15;   }   var imageAward = this.data.imageAward[j];   awardList.push({ topAward: topAward, leftAward: leftAward, imageAward: imageAward });  }  this.setData({   awardList: awardList  }) }, //开始游戏 startGame: function () {  if (this.data.isRunning) return  this.setData({   isRunning: true  })  var _this = this;  var indexSelect = 0  var i = 0;  var timer = setInterval(function () {   indexSelect++;   //这里我只是简单粗暴用y=30*x+200函数做的处理.可根据自己的需求改变转盘速度   i += 30;   if (i > 1000) {    //去除循环    clearInterval(timer)    //获奖提示    wx.showModal({     title: '恭喜您',     content: '获得了第' + (_this.data.indexSelect + 1) + "个优惠券",     showCancel: false,//去掉取消按钮     success: function (res) {      if (res.confirm) {       _this.setData({        isRunning: false       })      }     }    })   }   indexSelect = indexSelect % 8;   _this.setData({    indexSelect: indexSelect   })  }, (200 + i)) }})

/**index.wxss**/.container-out { height: 600rpx; width: 650rpx; background-color: #b136b9; margin: 100rpx auto; border-radius: 40rpx; box-shadow: 0 10px 0 #871a8e; position: relative;}.container-in { width: 580rpx; height: 530rpx; background-color: #871a8e; border-radius: 40rpx; position: absolute; left: 0; right: 0; top: 0; bottom: 0; margin: auto;}/**小圆球box-shadow: inset 3px 3px 3px #fff2af;*/.circle { position: absolute; display: block; border-radius: 50%; height: 20rpx; width: 20rpx;}.content-out { position: absolute; height: 150rpx; width: 166.6666rpx; background-color: #f5f0fc; border-radius: 15rpx; box-shadow: 0 5px 0 #d87fde;}/**居中 加粗*/.start-btn { position: absolute; margin: auto; top: 0; left: 0; bottom: 0; right: 0; border-radius: 15rpx; height: 150rpx; width: 166.6666rpx; background-color: #ffe400; box-shadow: 0 5px 0 #e7930a; color: #f6251e; text-align: center; font-size: 55rpx; font-weight: bolder; line-height: 150rpx;}.award-image { position: absolute; margin: auto; top: 0; left: 0; bottom: 0; right: 0; height: 140rpx; width: 130rpx;}

<!--index.wxml--><view class="container-out"> <view class="circle" wx:for="{{circleList}}" style="top:{{item.topCircle}}rpx;left:{{item.leftCircle}}rpx;background-color: {{(index%2==0)?colorCircleFirst:colorCircleSecond}};"></view> <view class="container-in">  <view class="content-out" wx:for="{{awardList}}" style="top:{{item.topAward}}rpx;left:{{item.leftAward}}rpx;background-color: {{(index==indexSelect)?colorAwardSelect:colorAwardDefault}};">   <image class="award-image" src="{{item.imageAward}}"></image>  </view>  <view class="start-btn" bindtap="startGame" style=" background-color:{{isRunning?'#e7930a':'#ffe400'}}">START</view> </view></view>