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91 lines
1.9 KiB
JavaScript
91 lines
1.9 KiB
JavaScript
import BLOG from '@/blog.config'
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import Head from 'next/head'
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import React, { useEffect, useRef, useState } from 'react'
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/**
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* 图片懒加载
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* @param {*} param0
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* @returns
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*/
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export default function LazyImage({
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priority,
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id,
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src,
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alt,
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placeholderSrc = BLOG.IMG_LAZY_LOAD_PLACEHOLDER,
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className,
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width,
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height,
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onLoad,
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style
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}) {
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const imageRef = useRef(null)
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const [imageLoaded, setImageLoaded] = useState(false)
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const handleImageLoad = () => {
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setImageLoaded(true)
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if (typeof onLoad === 'function') {
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onLoad() // 触发传递的onLoad回调函数
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}
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}
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useEffect(() => {
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const observer = new IntersectionObserver(
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(entries) => {
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entries.forEach((entry) => {
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if (entry.isIntersecting) {
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const lazyImage = entry.target
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lazyImage.src = src
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observer.unobserve(lazyImage)
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}
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})
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},
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{ rootMargin: '50px 0px' } // Adjust the rootMargin as needed to trigger the loading earlier or later
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)
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if (imageRef.current) {
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observer.observe(imageRef.current)
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}
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return () => {
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if (imageRef.current) {
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observer.unobserve(imageRef.current)
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}
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}
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}, [src])
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// 动态添加width、height和className属性，仅在它们为有效值时添加
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const imgProps = {
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ref: imageRef,
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src: imageLoaded ? src : placeholderSrc,
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alt: alt,
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onLoad: handleImageLoad
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}
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if (id) {
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imgProps.id = id
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}
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if (width && width !== 'auto') {
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imgProps.width = width
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}
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if (height && height !== 'auto') {
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imgProps.height = height
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}
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if (className) {
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imgProps.className = className
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}
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if (style) {
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imgProps.style = style
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}
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return (<>
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{/* eslint-disable-next-line @next/next/no-img-element */}
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<img {...imgProps} />
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{/* 预加载 */}
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{priority && <Head>
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<link rel='preload' as='image' src={src} />
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</Head>}
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</>)
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}
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