微信小程序实现转盘抽奖

效果图如下所示

.wxml

  
  
  
  一等奖
  二等奖
  三等奖
  四等奖
  五等奖
  六等奖
  

.wxss

.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;
}

.js

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)
  },
})

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