vue 转盘抽奖功能，可控制抽奖概率

实现逻辑：

思路：首先需要一个转盘，然后需要一个抽奖按钮定位在中间，图片提前设计或者用背景颜色代替（这里用的是图片，然后计算概率），使用css完成转动效果，每次转动完成之后情况定时器任务，具体代码看下面。

图片提供：（若是图片无法下载可留言）

指针图片：http://81.71.27.71:9000/pointer.png
抽奖图片：http://81.71.27.71:9000/turntable.png
抽奖背景图：http://81.71.27.71:9000/turntable-bg.jpg

实现效果：

 完整代码：

<template>
  <div class="dial">
    <div class="times">抽奖次数{
   
   {LuckyClick}}</div>
    <!-- 转盘包裹 -->
    <div class="rotate">
      <div
        :class="'circle circle_'+index"
        v-for="(item,index) in circleList"
        :key="index"
        :style="{background:index%2==0?colorCircleFirst:colorCircleSecond}"
      ></div>
      <img
        class="dish"
        src="@/assets/img/dial.jpg"
        :style="{transform:rotate_deg,transition:rotate_transition}"
      />
      <img class="pointer" src="@/assets/img/pointer.png" @click="start" />
     
    </div>

  </div>
</template>

<script>
var light_timer; //灯光定时器

export default {
  name: "dial",
  data() {
    return {
      LuckyClick: 3,
      circleList: [], //原点设置
      colorCircleFirst: "#FE4D32", //圆点颜色
      colorCircleSecond: "#fff", //圆点颜色

      cat: 45, //总共8个扇形区域，每个区域约45度
      isAllowClick: true, //是否能够点击
      rotate_deg: 0, //指针旋转的角度
      rotate_transition: "transform 3s ease-in-out" //初始化选中的过度属性控制
    };
  },

  components: {
    // Calendar: Calendar
  },
  created() {
    this.showcircleList();
  },

  watch: {},

  mounted() {},

  methods: {
    //绘制圆点设置
    showcircleList() {
      let circleList = [];
      for (var i = 0; i < 16; i++) {
        circleList.push(i);
      }
      this.circleList = circleList;
      this.light();
    },

    //闪动效果
    light: function() {
      var that = this;
      clearInterval(light_timer);
      light_timer = setInterval(function() {
        if (that.colorCircleFirst == "#FE4D32") {
          that.colorCircleFirst = "#fff";
          that.colorCircleSecond = "#FE4D32";
        } else {
          that.colorCircleFirst = "#FE4D32";
          that.colorCircleSecond = "#fff";
        }
      }, 300); //设置圆点闪烁的效果
    },

    start() {
      if (this.LuckyClick == 0) {
        alert("机会已经用完了");
        return;
      }
      this.rotating();
    },

    rotating() {
      if (!this.isAllowClick) return;
      this.isAllowClick = false;
      this.rotate_transition = "transform 3s ease-in-out";
      this.LuckyClick--;
      var rand_circle = 5; //默认多旋转5圈
      //   var winningIndex = Math.floor(Math.random() * 8); //获奖的下标   0-7   没有概率每个平均
      var winningIndex = this.set(); //设置了概率的

      console.log(winningIndex);
      var randomDeg = 360 - winningIndex * 45; //当前下标对应的角度    45是总共8个扇形区域，每个区域约45度

      var deg = rand_circle * 360 + randomDeg; //将要旋转的度数  由于是顺时针的转动方向需要用360度来减
      this.rotate_deg = "rotate(" + deg + "deg)";

      var that = this;
      setTimeout(function() {
        that.isAllowClick = true;
        that.rotate_deg = "rotate(" + 0 + "deg)"; //定时器关闭的时候重置角度
        that.rotate_transition = "";

        if (winningIndex == 0) {
          alert("恭喜您，IphoneX");
        } else if (winningIndex == 1) {
          alert("恭喜您，获得10元现金");
        } else if (winningIndex == 2) {
          alert("很遗憾，重在参与");
        } else if (winningIndex == 3) {
          alert("恭喜您，获得30元现金");
        } else if (winningIndex == 4) {
          alert("恭喜您，获得20元现金");
        } else if (winningIndex == 5) {
          alert("恭喜您，获得50元现金");
        } else if (winningIndex == 6) {
          alert("恭喜您，获得5元现金");
        } else if (winningIndex == 7) {
          alert("恭喜您，获得100元现金");
        }
      }, 3500);
    },

    //设置概率
    set() {
      var winIndex;
    //方法1
    //   if (Math.floor(Math.random() * 100) < 30) {
    //     console.log("30%的概率,重在参与");
    //     winIndex = 2;
    //   } else if (Math.floor(Math.random() * 100) < 55) {
    //     console.log("25%的概率,5元");
    //     winIndex = 6;
    //   } else if (Math.floor(Math.random() * 100) < 75) {
    //     console.log("20%的概率,10元");
    //     winIndex = 1;
    //   } else if (Math.floor(Math.random() * 100) < 85) {
    //     console.log("10%的概率,20元");
    //     winIndex = 4;
    //   } else if (Math.floor(Math.random() * 100) < 92) {
    //     console.log("7%的概率,30元");
    //     winIndex = 3;
    //   } else if (Math.floor(Math.random() * 100) < 97) {
    //     console.log("5%的概率,50元");
    //     winIndex = 5;
    //   } else if (Math.floor(Math.random() * 100) < 99) {
    //     console.log("2%的概率,100元");
    //     winIndex = 7;
    //   } else if (Math.floor(Math.random() * 100) == 99) {
    //     console.log("1%的概率,IphoneX");
    //     winIndex = 0;
    //   }
      

      //方法2
      var __rand__ = Math.random();
      if (__rand__ < 0.3) winIndex = 2;
      else if (__rand__ < 0.55) winIndex = 6;
      else if (__rand__ < 0.75) winIndex = 1;
      else if (__rand__ < 0.85) winIndex = 4;
      else if (__rand__ < 0.92) winIndex = 3;
      else if (__rand__ < 0.97) winIndex = 5;
      else if (__rand__ < 0.99) winIndex = 7;
      else if (__rand__ == 0.99) winIndex = 0;

      return winIndex;
    }
  },

  computed: {}
};
</script>


<style  scoped lang="scss">
// @import "../../common/common";
.times {
  text-align: center;
  line-height: 0.8rem;
  background: #fff;
}
.rotate {
  width: 6.1rem;
  height: 6.1rem;
  background: #ffbe04;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: absolute;
  top: 48%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.rotate .dish {
  width: 5.5rem;
  height: 5.5rem;
}

.pointer {
  width: 1.39rem;
  height: 2.03rem;
  position: absolute;
  top: 46%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* 圆点 */
.rotate .circle {
  position: absolute;
  display: block;
  border-radius: 50%;
  height: 0.16rem;
  width: 0.16rem;
  background: black;
}

.rotate .circle_0 {
  top: 0.08rem;
  left: 2.92rem;
}

.rotate .circle_1 {
  top: 0.28rem;
  left: 4.05rem;
}

.rotate .circle_2 {
  top: 0.86rem;
  left: 4.95rem;
}

.rotate .circle_3 {
  top: 1.85rem;
  left: 5.65rem;
}

.rotate .circle_4 {
  top: 2.85rem;
  right: 0.1rem;
}

.rotate .circle_5 {
  bottom: 1.89rem;
  right: 0.29rem;
}

.rotate .circle_6 {
  bottom: 0.96rem;
  right: 0.88rem;
}

.rotate .circle_7 {
  bottom: 0.34rem;
  right: 1.76rem;
}

.rotate .circle_8 {
  bottom: 0.06rem;
  right: 3.06rem;
}

.rotate .circle_9 {
  bottom: 0.28rem;
  left: 1.9rem;
}

.rotate .circle_10 {
  bottom: 0.96rem;
  left: 0.88rem;
}

.rotate .circle_11 {
  bottom: 1.82rem;
  left: 0.28rem;
}

.rotate .circle_12 {
  top: 2.9rem;
  left: 0.1rem;
}

.rotate .circle_13 {
  top: 1.9rem;
  left: 0.28rem;
}

.rotate .circle_14 {
  top: 1rem;
  left: 0.86rem;
}

.rotate .circle_15 {
  top: 0.32rem;
  left: 1.76rem;
}
</style>