如何在微信小程序实现一个幸运转盘小游戏

<view class="turntable">
  <view class="wrapper">
    <view class="item" >
	  <view class="item-inner">
		<text>10分</text>
	  </view>
	</view>
  </view>
</view>

.turntable {
  display: block;
  width: 100%;
  height: 600rpx;
}
.turntable .wrapper{
  position: relative;
  transform-origin: center;
  width: 100%;
  height: 600rpx;
}

.turntable .wrapper .item {
  position: absolute;
  left: 50%;
  width: 300rpx;
  height: 600rpx;
  border-radius: 0px 300rpx 300rpx 0;
  transform-origin: left center;
  transform: rotate(-30deg);
}
.turntable .wrapper .item .item-inner {
  text-align: center;
  width: 300rpx;
  height: 600rpx;
  transform: translateX(-300rpx) rotate(60deg); 
  transform-origin: right center;
  border-radius: 300rpx 0 0 300rpx;
  font-size: 32rpx;
}

.turntable .wrapper .item {
  position: absolute;
  left: 50%;
  width: 300rpx;
  height: 600rpx;
  border-radius: 0px 300rpx 300rpx 0;
  overflow: hidden;
  transform-origin: left center;
}
.turntable .wrapper .item .item-inner text {
  display: block;
  transform-origin: center;
  transform: translateY(100rpx) translateX(43rpx) rotate(-30deg);
}

.turntable .wrapper .item:nth-child(1) {
  transform: rotate(-30deg);
}

.turntable .wrapper .item:nth-child(2) {
  transform: rotate(-90deg);
}

.turntable .wrapper .item:nth-child(3) {
  transform: rotate(-150deg);
}

.turntable .wrapper .item:nth-child(4) {
  transform: rotate(-210deg);
}

.turntable .wrapper .item:nth-child(5) {
  transform: rotate(-270deg);
}

.turntable .wrapper .item:nth-child(6) {
  transform: rotate(-330deg);
}

<wxs module="computed">
	var rotate = function (index, length) {
		var inital = - (360 / length / 2)
		var averageRotate = 360 / length
		var deg = inital - averageRotate * index
		return 'transform: rotate(' + deg + 'deg);'
	}
	var inner = function (length) {
		var averageRotate = 360 / length
		return 'transform: translateX(-300rpx) rotate(' + averageRotate + 'deg);'
	}
	var text = function (length) {
		var distance = 0
		var rotate = 0
		switch (length) {
			case 6:
				distance = 43
				rotate = 30
				break
			case 8:
				distance = 72
				rotate = 30
				break
			case 4:
				distance = -20
				rotate = 40
				break
		}
		return 'transform: translateY(100rpx) translateX(' + distance + 'rpx) rotate(-45deg);'
	}
	module.exports = {
		rotate: rotate,
		inner: inner,
		text: text
	}
</wxs>

prize: [{
        'name': '1分',
        'winnning': 0.2,
        'count': 1
      },
      {
        'name': '谢谢参与',
        'winnning': 0.5,
        'count': 0
      }, {
        'name': '5分',
        'winnning': 0.05,
        'count': 5
      }, {
        'name': '7分',
        'winnning': 0.05,
        'count': 7
      }, 
      {
        'name': '3分',
        'winnning': 0.1,
        'count': 3
      }, 
      {
        'name': '4分',
        'winnning': 0.1,
        'count': 4
      }
    ],

getRange(winning) {
   let temp = []
     winning.forEach((item, index) => {
       if (index === 0) {
         temp.push(item['winnning'] * 360)
       } else {
         temp.push(parseInt(temp.slice(-1)) + item['winnning'] * 360)
       }
      })
      return temp
    },

let random = Math.round(Math.random() * 360)

for (let i in winningRange) {
    let currentwinning = winningRange[i] // 当前取值
       if (random < currentwinning) {
          this.setData({
            reward: i
          })
          break
      } else {
        if (i == 0) {
           continue
        }
        if (random >= winningRange[i - 1] && random <= currentwinning) {
           this.setData({
              reward: i
           })
           break
       }
     }
}

onPoint() {
      // 平均值
      const averageRotate = 360 / this.properties.prize.length
      // 是否有抽奖机会
      if (this.properties.chance === 0) {
        this.triggerEvent('none')
        return
      }
      // 防止转动时点击开始按钮
      if (!this.data.onRotation) {
        this.setData({
          onRotation: true
        })
        this.getReward()
        let deg = this.data.reward * averageRotate + 3 * 360  // 至少3圈以上
        this.animate('.wrapper', [{
            rotate: 0,
            ease: 'ease-in-out'
          },
          {
            rotate: deg,
            ease: 'ease-in-out'
          }
        ], 5000, function () {
          this.setData({
            onRotation: false
          })
          // 发送自己的抽奖信息
          this.triggerEvent('onResult', this.properties.prize[this.data.reward])
        }.bind(this))
      }
    },

onClear(){
   this.clearAnimation('.wrapper')
}