preface

---

To start!

Why encapsulate

• In line with the ES6 modular development philosophy
• Register global components, for better reuse, where you need to directly use the label name

---

Global components are registered as plugins in Vue3, and unified components in the project are added to the SRC/Components folder in a new carousel.vue file to write code

<template>
  <div class="xtx-carousel" @mouseenter="stop" @mouseleave="start">
    <ul class="carousel-body">
      <li class="carousel-item" v-for="(item, i) in sliders" :key="i" :class="{ fade: index === i }">
        <RouterLink to="/">
          <img :src="item.imgUrl" alt="" />
        </RouterLink>
      </li>
    </ul>
 <! -- Left and right control buttons -->
    <! -- Previous slide -->
    <a @click="toggle(-1)" href="javascript:;" class="carousel-btn prev"><i class="iconfont icon-angle-left"></i></a>
    <! -- Next slide -->
    <a @click="toggle(1)" href="javascript:;" class="carousel-btn next"><i class="iconfont icon-angle-right"></i></a>
     <! -- Pager -->
    <div class="carousel-indicator">
      <span v-for="(item, i) in sliders" :key="i" :class="{ active: index === i }"></span>
    </div>
  </div>
</template>

<script>
import { ref, watch } from 'vue'
export default {
  name: 'XtxCarousel'.props: {
    sliders: {
      type: Array.default: () = >[]},duration: {
      type: Number.default: 1000
    },
    autoplay: {
      type: Boolean.default: false
    }
  },
  setup (props) {
    // Index of images displayed by default
    const index = ref(0)
    // Auto play
    let timer = null
    const autoPlayFn = () = > {
      clearInterval(timer)
      timer = setInterval(() = > {
        index.value++
        if (index.value >= props.sliders.length) {
          index.value = 0
        }
      }, props.duration)
    }
    watch(
      () = > props.sliders,
      newVal= > {
        // Automatic play function is called only when automatic play is enabled
        if (newVal.length > 1 && props.autoplay) {
          index.value = 0
          autoPlayFn()
        }
      },
      { immediate: true})const stop = () = > {
      if (timer) clearInterval(timer)
    }
    const start = () = > {
      if (props.sliders.length && props.autoPlay) {
        autoPlayFn()
      }
    }
    // Go up, go down
    const toggle = step= > {
      index.value += step
      if (index.value >= props.sliders.length) {
        index.value = 0
        return
      }
      if (index.value < 0) {
        index.value = props.sliders.length - 1}}// Component consumption, clear timer
    // onUnmounted(() => {
    // if (timer.value) clearInterval(timer.value)
    // })
    return { index, start, stop, toggle }
  }
}
</script>

<style scoped lang="less">
.xtx-carousel{:deep(.carousel-btn.prev) {
    left: 270px;
  }
  :deep(.carousel-indicator) {
    padding-left: 250px; }}.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 0.5 s 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 0.5 s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px; &}}}:hover {
    .carousel-btn {
      opacity: 1; }}}</style>
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Registering global components

Create the index.js file in SRC/Components

// Extend vue's original functionality: global components, custom directives, mount prototype methods, note: no global filters.
// This is the plug-in
// Vue 2.0 plugin writing elements: export an object, install function, default passed in the Vue constructor, Vue based extension
// Vue3.0 plug-in writing elements: export an object, install function, default passed app application instance, app based on extension

import XtxCarousel from './xtx-carousel.vue'
export default {
  install (app) {
    // Extend on app, which provides component directive functions
    / / if you want to mount a prototype app. Config. GlobalProperties way
    app.component(XtxCarousel.name, XtxCarousel)
  }
}
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thenmain.jsFile registration

import {
  createApp
} from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'
// Import the reset style
import 'normalize.css'
// Import the global style
import '@/style/common.css'
// Font icon
import '@/assets/icon/iconfont.css'
// A custom plug-in
import XtxUI from '@/components/library'

createApp(App).use(store).use(router).use(XtxUI).mount('#app')
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Using the demonstration

Pass in custom attributes as required by the global component, using fixed data to simulate this. You can wrap a div element around the global component to control the size of the multicast diagram component

The code is as follows:

<template>
  <div class="home-banner">
    <XtxCarousel :list="sliders" class="xtx-carousel" />
  </div>
</template>
<script>
import { ref } from 'vue'
import { findBanner } from '@/api/home'
export default {
  name: 'HomeBanner',
  setup () {
    const sliders = ref([])
    findBanner().then(data= > {
      sliders.value = data.result
    })
    console.log(sliders)
    return { sliders }
  }
}
</script>
<style scoped lang="less">
.home-banner {
  width: 1240px;
  height: 500px;
  position: absolute;
  left: 0;
  top: 0;
  z-index: 98;
}
.xtx-carousel{:deep(.carousel-btn.prev) {
    left: 270px;
  }
  :deep(.carousel-indicator) {
    padding-left: 250px; }}</style>
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