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天猫超市翻牌的转盘经常用,以前做Android,没啥想法,现在尝试微信小程序,看到别人家APP里有啥好玩的,就想去做一个.

上GIF看效果:


简要的说一下.
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.

注释写了一些,凑合这看吧.有不对的地方,

欢迎批评!

上代码:
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?"#e7930a":"#ffe400"}}">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1colorCircleSecond: "#FE4D32",//圆点颜色2colorAwardDefault: "#F5F0FC",//奖品默认颜色colorAwardSelect: "#ffe400",//奖品选中颜色indexSelect: 0,//被选中的奖品indexisRunning: 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 = 15leftCircle = 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) returnthis.setData({ isRunning: true})var _this = this;var indexSelect = 0var 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)) }})
demo代码下载

demo

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