wordpress开启多站点模式,鹰潭市住房和城乡建设局网站,网站建设策划书前言,做自媒体素材搬运网站在HTML中#xff0c;懒加载#xff08;Lazy Load#xff09;是一种延迟加载图片或其他资源的技术#xff0c;它可以提高页面的加载速度和性能。下面是一种实现懒加载的方法#xff1a;
设置默认占位图片#xff1a;在HTML中#xff0c;为要延迟加载的图片设置一个默认的…在HTML中懒加载Lazy Load是一种延迟加载图片或其他资源的技术它可以提高页面的加载速度和性能。下面是一种实现懒加载的方法
设置默认占位图片在HTML中为要延迟加载的图片设置一个默认的占位符图片它将在图片加载之前显示。 img srcplaceholder.jpg data-srcimage.jpg altLazy Load Image 添加JavaScript代码为了实现懒加载我们需要使用JavaScript来检测图片是否在视口Viewport中可见如果是则加载实际图片。 document.addEventListener(DOMContentLoaded, function() {var lazyImages [].slice.call(document.querySelectorAll(img[data-src]));if (IntersectionObserver in window) {var lazyImageObserver new IntersectionObserver(function(entries, observer) {entries.forEach(function(entry) {if (entry.isIntersecting) {var lazyImage entry.target;lazyImage.src lazyImage.dataset.src;lazyImage.classList.remove(lazy);lazyImageObserver.unobserve(lazyImage);}});});lazyImages.forEach(function(lazyImage) {lazyImageObserver.observe(lazyImage);});} else {// 如果浏览器不支持Intersection Observer则简单地将所有的图片加载lazyImages.forEach(function(lazyImage) {lazyImage.src lazyImage.dataset.src;lazyImage.classList.remove(lazy);});}
}); 此JavaScript代码使用Intersection Observer API如果浏览器支持来观察图片是否在视口中可见。如果图片可见则将实际图片的URL赋值给src属性并从lazy类中移除。如果浏览器不支持Intersection Observer那么它会简单地将所有图片加载出来。 3. 样式调整为了更好地展示懒加载效果你可以为占位符图片和实际图片添加一些样式。 img {max-width: 100%;height: auto;display: block;
}
.lazy {filter: blur(5px); /* 可选模糊效果 */opacity: 0.5; /* 可选透明度降低 */
} 以上是一种实现懒加载的方法。当页面滚动或重新调整大小时图片将根据它们在视口中的可见性自动加载。 请注意懒加载并不局限于图片你也可以将它应用于其他需要延迟加载的资源比如视频或音频文件 完整代码
!DOCTYPE html
html
headtitleLazy Load/titlestyleimg {max-width: 100%;height: auto;display: block;}.lazy {filter: blur(5px); /* 可选模糊效果 */opacity: 0.5; /* 可选透明度降低 */}/style
/head
body
h1Lazy Load Example/h1
img srchttps://preview.qiantucdn.com/58pic/36/28/63/18558PICu3b842hxJc6mW_PIC2018.gif!w1024_new_small data-srchttps://img1.baidu.com/it/u422078137,1307526884fm253fmtautoapp120fJPEG?w1280h800 altLazy Load Image classlazy
img srchttps://preview.qiantucdn.com/58pic/36/28/63/18558PICu3b842hxJc6mW_PIC2018.gif!w1024_new_small data-srchttps://img2.baidu.com/it/u2546424698,318222608fm253fmtautoapp138fJPEG?w889h500 altLazy Load Image classlazy
img srchttps://preview.qiantucdn.com/58pic/36/28/63/18558PICu3b842hxJc6mW_PIC2018.gif!w1024_new_small data-srchttps://img1.baidu.com/it/u422078137,1307526884fm253fmtautoapp120fJPEG?w1280h800 altLazy Load Image classlazy
img srchttps://preview.qiantucdn.com/58pic/36/28/63/18558PICu3b842hxJc6mW_PIC2018.gif!w1024_new_small data-srchttps://img1.baidu.com/it/u422078137,1307526884fm253fmtautoapp120fJPEG?w1280h800 altLazy Load Image classlazy
img srchttps://preview.qiantucdn.com/58pic/36/28/63/18558PICu3b842hxJc6mW_PIC2018.gif!w1024_new_small data-srchttps://img2.baidu.com/it/u2546424698,318222608fm253fmtautoapp138fJPEG?w889h500 altLazy Load Image classlazy
img srchttps://preview.qiantucdn.com/58pic/36/28/63/18558PICu3b842hxJc6mW_PIC2018.gif!w1024_new_small data-srchttps://img1.baidu.com/it/u3622442929,3246643478fm253fmtautoapp138fJPEG?w889h500 altLazy Load Image classlazy
img srchttps://preview.qiantucdn.com/58pic/36/28/63/18558PICu3b842hxJc6mW_PIC2018.gif!w1024_new_small data-srchttps://img1.baidu.com/it/u422078137,1307526884fm253fmtautoapp120fJPEG?w1280h800 altLazy Load Image classlazy
img srchttps://preview.qiantucdn.com/58pic/36/28/63/18558PICu3b842hxJc6mW_PIC2018.gif!w1024_new_small data-srchttps://img2.baidu.com/it/u2546424698,318222608fm253fmtautoapp138fJPEG?w889h500 altLazy Load Image classlazy
img srchttps://preview.qiantucdn.com/58pic/36/28/63/18558PICu3b842hxJc6mW_PIC2018.gif!w1024_new_small data-srchttps://img2.baidu.com/it/u2312383180,3750420672fm253fmtautoapp120fJPEG?w1280h800 altLazy Load Image classlazyscriptdocument.addEventListener(DOMContentLoaded, function() {var lazyImages [].slice.call(document.querySelectorAll(img.lazy));if (IntersectionObserver in window) {var lazyImageObserver new IntersectionObserver(function(entries, observer) {entries.forEach(function(entry) {if (entry.isIntersecting) {var lazyImage entry.target;lazyImage.src lazyImage.dataset.src;lazyImage.classList.remove(lazy);lazyImageObserver.unobserve(lazyImage);}});});lazyImages.forEach(function(lazyImage) {lazyImageObserver.observe(lazyImage);});} else {lazyImages.forEach(function(lazyImage) {lazyImage.src lazyImage.dataset.src;lazyImage.classList.remove(lazy);});}});
/script
/body
/html
实现效果
