Vue realizes the palace grid rotation lottery

<template>
  <div class="home">
    <div class="home-container">
      <div class="home-container-line">
        <div
          class="home-container-line-box"
          v-for="item in list.slice(0, 5)"
          :key="item.index"
          :class="{ selected: item.active }"
        >
          {{ item.label }}
        </div>
      </div>
      <div class="home-container-line">
        <div
          class="home-container-line-box"
          v-for="item in list.slice(11, 12)"
          :key="item.index"
          :class="{ selected: item.active }"
        >
          {{ item.label }}
        </div>
        <div class="home-container-line-btn" @click="handleClick" :disable="isAnimate"></div>
        <div
          class="home-container-line-box"
          v-for="item in list.slice(5, 6)"
          :key="item.index"
          :class="{ selected: item.active }"
        >
          {{ item.label }}
        </div>
      </div>
      <div class="home-container-line">
        <div
          class="home-container-line-box"
          v-for="item in Array.prototype.reverse.call(list.slice(6, 11))"
          :key="item.index"
          :class="{ selected: item.active }"
        >
          {{ item.label }}
        </div>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: "Luck",
  data() {
    return {
      list: [
        { label: "Not winning", val: 1, img: "", index: 0, active: false },
        { label: "Health Care", val: 2, img: "", index: 1, active: false },
        { label: "iPhone13", val: 3, img: "", index: 2, active: false },
        { label: "MacBook Pro", val: 4, img: "", index: 3, active: false },
        { label: "MacBook Air", val: 5, img: "", index: 4, active: false },
        { label: "1 point", val: 6, img: "", index: 5, active: false },
        { label: "5 points", val: 7, img: "", index: 6, active: false },
        { label: "10 points", val: 8, img: "", index: 7, active: false },
        { label: "Xiao Ai", val: 9, img: "", index: 8, active: false },
        { label: "Anmuxi Yogurt", val: 10, img: "", index: 9, active: false },
        { label: "Clear shopping cart", val: 11, img: "", index: 10, active: false },
        { label: "50 yuan phone bill", val: 12, img: "", index: 11, active: false },
      ],
      isAnimate: false, // true means the lottery is in progress. Clicking the lottery button before the current lottery ends is invalid jumpIndex: Math.floor(Math.random() * 12), // Index of the lottery jump jumpingTime: 0, // Time of the jump jumpingTotalTime: 0, // Total jump time, based on the duration variable plus a random number between 0 and 1000 jumpingChange: 0, // Peak jump rate, based on the velocity variable plus a random number between 0 and 3 duration: 4500, // Duration velocity: 300, // Velocity};
  },
  methods: {
    handleClick() {
      if(this.isAnimate) return;
      this.jumpingTime = 0;
      this.jumpingTotalTime = Math.random() * 1000 + this.duration;
      this.jumpingChange = Math.random() * 3 + this.velocity;
      this.animateRound(this.jumpIndex);
    },

    animateRound(index) {
      this.isAnimate = true; 
      if(this.jumpIndex < this.list.length - 1 ) this.jumpIndex ++;
      if (this.jumpIndex >= this.list.length - 1 ) this.jumpIndex = 0;

      this.jumpingTime += 100; // The time consumed by executing the setTimeout method in each frame // If the current time is greater than the total time, exit the animation and clear the prize if (this.jumpingTime >= this.jumpingTotalTime) {
        this.isAnimate = false; 
        if(index == 0) {
          alert(`It's a pity that I didn't win the prize, keep up the good work~`);
        }
        else{
          alert(`Congratulations, you have drawn: ${this.list[index].label}`)
        }
        return
      }

      // Rotation animation if (index >= this.list.length-1) {
        index = 0;
        this.list[11].active = false;
        this.list[index].active = true;
        index -= 1;
      } else {
        this.list[index].active = false;
        this.list[index + 1].active = true;
      }

      setTimeout(() => {
        this.animateRound(index + 1);
      }, this.easeOut(this.jumpingTime, 0, this.jumpingChange, this.jumpingTotalTime));
    },

    /**
     * Easing function, from fast to slow* @param {Num} t current time* @param {Num} b initial value* @param {Num} c change value* @param {Num} d duration*/
    easeOut(t, b, c, d) {
      if ((t /= d / 2) < 1) return (c / 2) * t * t + b;
      return (-c / 2) * (--t * (t - 2) - 1) + b;
    },
  },
};
</script>
<style lang="scss" scoped>
.center {
  display: flex;
  justify-content: center;
  align-items: center;
}
.home {
  padding: 0;
  margin: 0;
  width: 100%;
  height: calc(100vh - 16px);
  background-image: linear-gradient(25deg, #30007c, #464995, #4d83ad, #41bfc4);
  @extend .center;
  &-container {
    width: 1000px;
    height: 600px;
    &-line {
      width: 100%;
      height: 198px;
      display: flex;
      &-box {
        flex: 1;
        overflow: hidden;
        margin: 5px 3px 5px 3px;
        @extend .center;
        background: #fff;
        transition: all .3s;
      }
      &-btn {
        position: relative;
        flex: 3;
        overflow: hidden;
        margin: 5px 3px 3px 3px;
        @extend .center;
        box-shadow: 0 1px 10px 0px #cf5531;
        background-image: linear-gradient(
          25deg,
          #cf5531,
          #d0853a,
          #cdaf43,
          #c4d84d
        );
        cursor: pointer;
        &:active {
          background-image: linear-gradient(
            25deg,
            #3f3e41,
            #6d6340,
            #9a8b39,
            #c9b629
          );
        }
        &::before {
          position: absolute;
          content: "Click to win the prize";
          font-size: 2.5rem;
          color: #fff;
          font-weight: bold;
        }
      }
    }
  }
}
.selected {
  background: rgba($color: #f6e58d, $alpha: 0.5);
  animation-name: twinkle;
  animation-duration: 3s;
  animation-iteration-count: infinite;
}
@keyframes twinkle {
  0% {background:#ffbe76;}
 100% {background:#f6e58d;}
}
</style>