vue 实现图片切换

Vue 实现图片切换的方法

基础图片切换（数组遍历）

通过v-for遍历图片数组，结合v-bind动态绑定图片路径：

<template>
  <div>
    <img :src="currentImage" alt="Current Image">
    <button @click="prevImage">上一张</button>
    <button @click="nextImage">下一张</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      images: [
        'image1.jpg',
        'image2.jpg',
        'image3.jpg'
      ],
      currentIndex: 0
    }
  },
  computed: {
    currentImage() {
      return this.images[this.currentIndex]
    }
  },
  methods: {
    nextImage() {
      this.currentIndex = (this.currentIndex + 1) % this.images.length
    },
    prevImage() {
      this.currentIndex = (this.currentIndex - 1 + this.images.length) % this.images.length
    }
  }
}
</script>

过渡动画效果

使用Vue的transition组件添加切换动画：

<transition name="fade" mode="out-in">
  <img :key="currentImage" :src="currentImage" alt="Slideshow">
</transition>

<style>
.fade-enter-active, .fade-leave-active {
  transition: opacity 0.5s;
}
.fade-enter, .fade-leave-to {
  opacity: 0;
}
</style>

自动轮播功能

添加定时器实现自动轮播：

mounted() {
  this.startAutoPlay()
},
methods: {
  startAutoPlay() {
    this.timer = setInterval(() => {
      this.nextImage()
    }, 3000)
  },
  stopAutoPlay() {
    clearInterval(this.timer)
  }
}

使用第三方库

对于更复杂的需求，可以使用专用轮播库如vue-awesome-swiper：

import VueAwesomeSwiper from 'vue-awesome-swiper'
import 'swiper/css/swiper.css'

Vue.use(VueAwesomeSwiper)

<template>
  <swiper :options="swiperOptions">
    <swiper-slide v-for="(image, index) in images" :key="index">
      <img :src="image">
    </swiper-slide>
    <div class="swiper-pagination" slot="pagination"></div>
  </swiper>
</template>

响应式图片处理

根据屏幕尺寸切换不同分辨率图片：

data() {
  return {
    responsiveImages: {
      small: 'small.jpg',
      medium: 'medium.jpg',
      large: 'large.jpg'
    }
  }
},
computed: {
  dynamicImage() {
    const width = window.innerWidth
    if (width < 768) return this.responsiveImages.small
    if (width < 1024) return this.responsiveImages.medium
    return this.responsiveImages.large
  }
}