微信小程式開發之大轉盤仿天貓超市抽獎效果代碼分享

本篇文章主要介紹了微信小程式開發之大轉盤仿天貓超市抽獎效果代碼分享，這裡整理了詳細的代碼,具有一定的參考價值，有興趣的小伙伴們可以參考一下。

天貓超市翻牌的轉盤常用,以前做Android,沒啥想法,現在嘗試微信小程式,看到別人家APP裡有啥好玩的,就想去做一個.

上GIF看效果:

#簡單的說一下.

1.外面一圈閃爍的小球是用js控制的樣式.500ms改變一次樣式.簡單粗暴;

2.抽獎的item也是js控制背景,但是怎麼樣讓它優雅的停下來是個問題.動畫中有timingFunction可以設定速度.自己用js就沒那麼簡單了.我這裡用setInterval(),時間是線性變化的.換個斜率先小後大的函數效果應該會好一些.

註解寫了一些,湊合這看吧.有不對的地方,

歡迎批評!

上程式碼:
1.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?&#39;#e7930a&#39;:&#39;#ffe400&#39;}}">START</view>
 </view>
</view>

2.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;
}

3.index.js

# #####

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 == &#39;#FFDF2F&#39;) {
    _this.setData({
     colorCircleFirst: &#39;#FE4D32&#39;,
     colorCircleSecond: &#39;#FFDF2F&#39;,
    })
   } else {
    _this.setData({
     colorCircleFirst: &#39;#FFDF2F&#39;,
     colorCircleSecond: &#39;#FE4D32&#39;,
    })
   }
  }, 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: &#39;恭喜您&#39;,
     content: &#39;获得了第&#39; + (_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))
 }
})

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