Vue3.0 handwritten carousel effect

<template>
  <div class="xtx-carousel" @mouseleave="enterFn" @mouseenter="leaveFn">
    <ul class="carousel-body">
      <li class="carousel-item" :class="{ fade: indexid === index }" v-for="(item, index) in list" :key="item.id">
        <RouterLink to="/">
          <img :src="item.imgUrl" alt="" />
        </RouterLink>
      </li>
    </ul>
    <a href="javascript:;" class="carousel-btn prev" @click="lastPage"><i class="iconfont icon-angle-left"></i></a>
    <a href="javascript:;" class="carousel-btn next" @click="nextPage"><i class="iconfont icon-angle-right"></i></a>
    <div class="carousel-indicator">
      <span @click="indexid = i - 1" v-for="i in list.length" :key="i" :class="{ active: indexid === i - 1 }"></span>
    </div>
  </div>
</template>

<script>
import { ref, watch, onUnmounted } from 'vue'
export default {
  name: 'Carousel',
  props: {
    // Image data list: {
      type: Object,
      default: () => {}
    },
    // Duration of each switching event of the carousel: {
      type: Number,
      default: 2
    },
    // Whether to enable autoplay of carousel: {
      type: Boolean,
      default: true
    },
    // Click to turn several pages: {
      type: Number,
      default: 1
    }
  },
  setup(props) {
    // Index const indexid = ref(0)
    // Carousel const timer = ref(null)
    const TimeFn = () => {
      clearInterval(timer)
      // Clear the previous timer before each execution timer.value = setInterval(() => {
        indexid.value++
        // If it exceeds the limit, refill if (indexid.value > props.list.length - 1) {
          indexid.value = 0
        }
      }, props.duration * 1000)
    }
    // Click + next stop picture const nextPage = () => {
      indexid.value += props.page
      if (indexid.value > props.list.length - 1) {
        indexid.value = 0
      }
    }
    // Click + previous picture const lastPage = () => {
      indexid.value -= props.page
      if (indexid.value < 0) {
        indexid.value = props.list.length - 1
      }
    }
    // Clear timer const leaveFn = () => {
      // console.log('clear timer')
      clearInterval(timer.value)
      // console.log(timer)
    }
    // Component consumption, cleanup timer onUnmounted(() => {
      clearInterval(timer.value)
    })
    // Start the timer const enterFn = () => {
      if (props.list.length > 1 && props.autoplay) {
        // console.log('Start timer')
        TimeFn()
      }
    }
    watch(
      () => props.list,
      () => {
        if (props.list.length > 1 && props.autoplay) {
          TimeFn()
        }
      }
    )
    return { indexid, leaveFn, enterFn, nextPage, lastPage }
  }
}
</script>

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
</style>

import Carousel from '../carousel.vue'
// Vue2.0 plugin writing elements: export an object, have install function, pass in Vue constructor by default, extend Vue based on // Vue3.0 plugin writing elements: export an object, have install function, pass in app application instance by default, extend app based on export default {
  install(app) {
    // Expand on app, app provides component directive function // If you want to mount the prototype app.config.globalProperties method app.component(Carousel.name, xtxCarousel)
  }
}

import { createApp } from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'
import libraryUI from '@/components/library/index' //own plugin createApp(App)
  .use(store)
  .use(router)
  .use(libraryUI) // Mount the plugin.mount('#app')

<Carousel :list="list" duration="1" />