<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: {
    // 图片数据
    list: {
      tyPE: Object,
      default: () => {}
    },
    // 轮播图每张切换的事件
    duration: {
      type: Number,
      default: 2
    },
    // 是否开启轮播图
    autoplay: {
      type: Boolean,
      default: true
    },
    // 点击翻几张
    page: {
      type: Number,
      default: 1
    }
  },
  SETUP(props) {
    // 索引
    const indexid = ref(0)
    // 轮播
    const timer = ref(null)
    const TimeFn = () => {
      clearInterval(timer)
      // 每次执行前都清除上一次的定时器
      timer.value = setInterval(() => {
        indexid.value++
        // 如果超出界限就重新回填
        if (indexid.value > props.list.length - 1) {
          indexid.value = 0
        }
      }, props.duration * 1000)
    }
    // 点击+下一站图片
    const nextPage = () => {
      indexid.value += props.page
      if (indexid.value > props.list.length - 1) {
        indexid.value = 0
      }
    }
    // 点击+上一张图片
    const lastPage = () => {
      indexid.value -= props.page
      if (indexid.value < 0) {
        indexid.value = props.list.length - 1
      }
    }
    // 清除定时器
    const leaveFn = () => {
      // console.LOG('清除定时器')
      clearInterval(timer.value)
      // console.log(timer)
    }
    // 组件消耗，清理定时器
    onUnmounted(() => {
      clearInterval(timer.value)
    })
    // 开启定时器
    const enterFn = () => {
      if (props.list.length > 1 && props.autoplay) {
        // console.log('开启定时器')
        TimeFn()
      }
    }
    watch(
      () => props.list,
      () => {
        if (props.list.length > 1 &amp;& 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插件写法要素：导出一个对象，有install函数，默认传入了Vue构造函数，Vue基础之上扩展
// vue3.0插件写法要素：导出一个对象，有install函数，默认传入了app应用实例，app基础之上扩展

export default {
  install(app) {
    // 在app上进行扩展，app提供 component directive 函数
    // 如果要挂载原型 app.config.globalProperties 方式
    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' //自己的插件
createApp(App)
  .use(store)
  .use(router)
  .use(libraryUI) // 挂载插件
  .mount('#app')

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