微信小程序：跑马灯抽奖(仿天猫)

【实例简介】

微信小程序 圆盘抽奖

【实例截图】

【核心代码】

//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))
  }
})