Vue Swipe实现图片懒加载：轻松提升网页性能与用户体验

摘要

引言

Vue Swipe简介

图片懒加载原理

Vue Swipe实现图片懒加载

1. 安装Vue Swipe

首先，需要在项目中安装Vue Swipe：

npm install vue-swipe --save

2. 引入Vue Swipe

在Vue组件中引入Vue Swipe：

import Vue from 'vue';
import { Swipe, SwipeItem } from 'vue-swipe';

Vue.component('swipe', Swipe);
Vue.component('swipe-item', SwipeItem);

3. 使用Vue Swipe组件

<template>
  <swipe class="swipe-container">
    <swipe-item v-for="(item, index) in imageList" :key="index">
      <img :src="item.placeholder" :data-src="item.url" @load="handleLoad" />
    </swipe-item>
  </swipe>
</template>

4. 实现图片懒加载

export default {
  data() {
    return {
      imageList: [
        { url: 'https://example.com/image1.jpg', placeholder: 'https://example.com/placeholder1.jpg' },
        { url: 'https://example.com/image2.jpg', placeholder: 'https://example.com/placeholder2.jpg' },
        // ... 其他图片
      ],
    };
  },
  methods: {
    handleLoad(event) {
      event.target.src = event.target.getAttribute('data-src');
    },
  },
};

5. 使用IntersectionObserver API优化性能

export default {
  data() {
    return {
      imageList: [
        { url: 'https://example.com/image1.jpg', placeholder: 'https://example.com/placeholder1.jpg' },
        { url: 'https://example.com/image2.jpg', placeholder: 'https://example.com/placeholder2.jpg' },
        // ... 其他图片
      ],
    };
  },
  mounted() {
    const observer = new IntersectionObserver((entries, observer) => {
      entries.forEach((entry) => {
        if (entry.isIntersecting) {
          const img = entry.target;
          img.src = img.getAttribute('data-src');
          observer.unobserve(img);
        }
      });
    }, {
      rootMargin: '0px',
      threshold: 0.1,
    });

    this.imageList.forEach((item, index) => {
      const img = this.$refs['image' + index];
      observer.observe(img);
    });
  },
};

总结