微信小程序实现转盘抽奖

<view class="index">
 <view class="xian"></view>
 <view class="xian"></view>
 <view class="xian"></view>
 <view class="detail">一等奖</view>
 <view class="detail">二等奖</view>
 <view class="detail">三等奖</view>
 <view class="detail">四等奖</view>
 <view class="detail">五等奖</view>
 <view class="detail">六等奖</view>
 <span bindtap="zhuanin" style="transform:rotate({{trasn}}deg);"></span>
</view>

.index{
 width: 300px;
 margin: 50rpx calc((100% - 300px) / 2);
 border:1px solid #ffcccc;
 border-radius: 50%;
 height: 300px;
 position: relative;
 overflow: hidden;
 font-size: 26rpx;
}
.xian{
 width:300px;
 height:1px;
 background:#d6d6d6;
 position:absolute;
 top:150px;
 left:0;
}
.index>.xian:nth-child(2){
 transform:rotateZ(60deg)
}
.index>.xian:nth-child(3){
 transform:rotateZ(120deg)
}
.detail{
 position: absolute;
}
.index>.detail:nth-child(4){
 top:25px;left:132px;
}
.index>.detail:nth-child(5){
 top:90px;left:225px;
}
.index>.detail:nth-child(6){
 top:190px;left:225px;
}
.index>.detail:nth-child(7){
 top:250px;left:132px;
}
.index>.detail:nth-child(8){
 top:190px;left:40px;
}
.index>.detail:nth-child(9){
 top:90px;left:40px;
}
.index>span{
 width: 30px;
 height: 30px;
 background-color: #ffcccc;
 border-radius: 50%;
 position: absolute;
 left: 135px;
 top:135px;
}
.index>span::after{
 content: ' ';
 width:0;
 height:0;
 border-right:6px solid transparent;
 border-left:6px solid transparent;
 border-bottom:26px solid #ffcccc;
 z-index: 10;
 position: absolute;
 left: 8.5px;
 top: -24px;
}

Page({
 data: {
 random:'',
 trasn:0,
 },
 zhuanin:function(e){
 let that = this
 let num = 0
 that.setData({
  random:Math.floor(Math.random() * 360),
  trasn:0,
 })
 let a = setInterval(function () {
  that.setData({
  trasn:that.data.trasn+5
  })
  if(360 <= that.data.trasn){
  that.data.trasn = 0
  num = num + 1
  }
  if(num == 3){
  that.currinl()
  clearInterval(a)
  }
 },5)
 },
 currinl:function(e){
 let that = this
 let name = ''
 if(that.data.random == 30 || that.data.random == 90 || that.data.random == 150 || that.data.random == 210 || that.data.random == 330){
  that.setData({
  random:that.data.random + 1
  })
 }
 if(that.data.random < 30 || 330 < that.data.random){
  name = '一等奖'
 }else if(that.data.random > 30 && that.data.random < 90){
  name = '二等奖'
 }else if(that.data.random > 90 && that.data.random < 150){
  name = '三等奖'
 }else if(that.data.random > 150 && that.data.random < 210){
  name = '四等奖'
 }else if(that.data.random > 210 && that.data.random < 270){
  name = "五等奖"
 }else{
  name = "六等奖"
 }
 let b = setInterval(function () {
  that.setData({
  trasn:that.data.trasn+2
  })
  if(that.data.random <= that.data.trasn){
  wx.showToast({
   title: name,
   icon: 'none',
   duration: 2000
  })
  clearInterval(b)
  }
 },10)
 },
})