基本实现功能
1，小程序仿天猫超市抽奖大转盘
2，跑马灯效果
3，开始抽奖，抽奖完成后有弹窗
先看效果图
简单说一下
1.外面一圈闪烁的小球是用js控制的样式.500ms改变一次样式.简单粗暴;
2.抽奖的item也是js控制背景,但是怎么样让它优雅的停下来是个问题.动画中有timingFunction可以设置速度.
自己用js就没那么简单了.我这里用setInterval(),时间是线性变化的.换个斜率先小后大的函数效果应该会好一些.
实现源码，看注释应该能看懂，有问题欢迎批评！
上源码
<!--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> /**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; }
下面是主要实现代码
//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)//设置圆点闪烁的效果 //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 }) }, //开始抽奖 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)) } })
