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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,2 @@ | ||
| # 环境变量 @see https://www.nextjs.cn/docs/basic-features/environment-variables | ||
| NEXT_PUBLIC_VERSION=4.0.1 | ||
| NEXT_PUBLIC_VERSION=4.0.3 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| import Head from 'next/head' | ||
| import React, { useEffect, useRef, useState } from 'react' | ||
|
|
||
| /** | ||
| * 默认懒加载占位图 | ||
| */ | ||
| const loadingSVG = ( | ||
| <svg | ||
| width="100" | ||
| height="100" | ||
| viewBox="0 0 100 100" | ||
| xmlns="http://www.w3.org/2000/svg" | ||
| fill="#ccc" | ||
| > | ||
| <circle cx="50" cy="50" r="42" strokeWidth="8" /> | ||
| </svg> | ||
| ) | ||
|
|
||
| /** | ||
| * 图片懒加载 | ||
| * @param {*} param0 | ||
| * @returns | ||
| */ | ||
| export default function LazyImage({ | ||
| priority, | ||
| id, | ||
| src, | ||
| alt, | ||
| placeholderSrc = loadingSVG, | ||
| className, | ||
| width, | ||
| height, | ||
| onLoad, | ||
| style | ||
| }) { | ||
| const imageRef = useRef(null) | ||
| const [imageLoaded, setImageLoaded] = useState(false) | ||
|
|
||
| const handleImageLoad = () => { | ||
| setImageLoaded(true) | ||
| if (typeof onLoad === 'function') { | ||
| onLoad() // 触发传递的onLoad回调函数 | ||
| } | ||
| } | ||
|
|
||
| useEffect(() => { | ||
| const observer = new IntersectionObserver( | ||
| (entries) => { | ||
| entries.forEach((entry) => { | ||
| if (entry.isIntersecting) { | ||
| const lazyImage = entry.target | ||
| lazyImage.src = src | ||
| observer.unobserve(lazyImage) | ||
| } | ||
| }) | ||
| }, | ||
| { rootMargin: '50px 0px' } // Adjust the rootMargin as needed to trigger the loading earlier or later | ||
| ) | ||
|
|
||
| if (imageRef.current) { | ||
| observer.observe(imageRef.current) | ||
| } | ||
|
|
||
| return () => { | ||
| if (imageRef.current) { | ||
| observer.unobserve(imageRef.current) | ||
| } | ||
| } | ||
| }, [src]) | ||
|
|
||
| // 动态添加width、height和className属性，仅在它们为有效值时添加 | ||
| const imgProps = { | ||
| ref: imageRef, | ||
| src: imageLoaded ? src : placeholderSrc, | ||
| alt: alt, | ||
| onLoad: handleImageLoad | ||
| } | ||
|
|
||
| if (id) { | ||
| imgProps.id = id | ||
| } | ||
|
|
||
| if (width && width !== 'auto') { | ||
| imgProps.width = width | ||
| } | ||
|
|
||
| if (height && height !== 'auto') { | ||
| imgProps.height = height | ||
| } | ||
| if (className) { | ||
| imgProps.className = className | ||
| } | ||
| if (style) { | ||
| imgProps.style = style | ||
| } | ||
| return (<> | ||
| {/* eslint-disable-next-line @next/next/no-img-element */} | ||
| <img {...imgProps} /> | ||
| {/* 预加载 */} | ||
| {priority && <Head> | ||
| <link rel='preload' as='image' src={src} /> | ||
| </Head>} | ||
| </>) | ||
| } |
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