vue3.0项目中实现手动封装轮播图

Posted 2021-08-15 奥特曼　

推荐现成网站

 

https://www.swiper.com.cn/

实现效果图

轮播图公共组件 （完整代码）

<template>
  <div class='xtx-carousel' @mouseenter="enter" @mouseleave="leave">
    <ul class="carousel-body">
      <li class="carousel-item" v-for="(item,i) in sliders" :class="{fade:i===idx}" :key="item.id" >
        <RouterLink to="/">
          <img :src="item.imgUrl">
        </RouterLink>
      </li>
    </ul>
    <a href="javascript:;" class="carousel-btn prev" @click="toggle(-1)"><i class="iconfont icon-angle-left"></i></a>
    <a href="javascript:;" class="carousel-btn next" @click="toggle(1)"><i class="iconfont icon-angle-right"></i></a>
    <div class="carousel-indicator">
      <span v-for="(item,i) in sliders.length" @click="idx=i" :class="{active:idx===i}" :key="i"></span>
    </div>
  </div>
</template>

<script>
import { onUnmounted, ref, watch } from 'vue'
export default {
  name: 'XtxCarousel',
  props: {
    sliders: {
      default: () => [],
      type: Array
    },
    autoplay: {
      default: true,
      type: Boolean
    },
    time: {
      default: 2000,
      type: Number
    }
  },
  setup (props) {
    // 当前选中值
    const idx = ref(0)
    // 定时器id
    let timer = null
    const doAotuplay = () => {
      timer = setInterval(() => {
        idx.value++
        if (idx.value >= props.sliders.length) {
          idx.value = 0
        }
      }, props.time)
    }
    // 监听图片数据的变化
    watch(() => { return props.sliders }, (newValue, oldValue) => {
      // 如果为true就自动播放
      if (newValue.length && props.autoplay) {
        idx.value = 0
        doAotuplay()
      }
    }, { immediate: true })
    // 组件销毁后 关闭定时器
    onUnmounted(() => {
      clearInterval(timer)
    })

    // 鼠标进入关闭定时器
    const enter = () => {
      clearInterval(timer)
    }
    // 鼠标离开后开启定时器
    const leave = () => {
      doAotuplay()
    }

    // 上一页下一页
    const toggle = (i) => {
      idx.value += i
      // 如果索引大于长度就从0开始
      if (idx.value >= props.sliders.length) {
        idx.value = 0
      }
      // 如果索引小于0就从长度-1开始 因为是按照索引排的要减一
      if (idx.value < 0) {
        idx.value = props.sliders.length - 1
      }
    }
    return { idx, timer, enter, leave, toggle }
  }
}
</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,.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>

注册全局组件

  app.component(XtxCarousel.name, XtxCarousel)

使用组件

 <XtxCarousel :sliders="sliders" :aotuplay="true" :time="2000" />

轮播图组件中 sliders代表数据  循环每一项的img图片 到时候使用的时候需要手动的修改一下数据， autoplay为true的时候才会去自动播放  time代表多少秒播放下一张图片