Techniques for Lazy Loading Images in Javascript 1. Using EventListeners 2. Using Intersection Observer API This article describes what lazy loading of an image is, its significance, techniques, best practices
基础概念: JavaScript 懒加载(Lazy Loading)是一种优化网页性能的技术,它延迟加载页面上非关键资源,直到这些资源即将进入用户的视野范围。这种技术可以显著减少初始页面加载时间,提高用户体验。 优势: 减少初始加载时间:通过仅加载视口内的内容,可以加快页面的首次渲染速度。
LazyLoad.js is a lightweight JavaScript library that simplifies lazy loading for images and other media elements. It triggers the lazy loading function execution only when images enter the viewport. To use it: 1. Include the library in your project: 2. Replace the src attribute in your imag...
It's not recommended to use a Javascript library like Jquery to lazy load images, unless you were already loading the library on your web pages anyway. Loading the Jquery.js file isn’t optimal for page speed sinceJavascript libraries can slow your website down. ...
Better User Experience: Lazy loading creates a seamless browsing experience by progressively loading images as users scroll, preventing lags and unnecessary delays. Also Read: How to perform Visual Regression Testing using Selenium in JavaScript Disadvantages of Lazy Loading Images Though it has some gre...
Lazy Loading Images Use ablank.gifas thesrcof images, and include thewidthandheightof the final image. HTML: JavaScript: /*lazyload.js (c) Lorenzo Giuliani * MIT License (http://www.opensource.org/licenses/mit-license.html) * * expects...
When it comes to websites performance is king. How long it takes for a page to load can mean the difference of millions of dollars for large ecommerce sites. In this lesson we'll use the IntersectionObserver to check when an image is in the viewport to defer loading the image. ...
It finds images with the attribute data-src (it is like a placeholder) and it sets up a "watcher" for each image.The watcher(IntersectionObserver) will check if the image is in the viewport and if it found that it is, it will load the actual image and remove the data-src attribute....
Discover five techniques to lazy load images for better website performance. Learn how to add lazy loading in HTML, JavaScript, and on scroll.
A few years ago, browsers implemented a standard way of lazy loading images. The standard was a huge boon because it was straightforward to use and less code than JavaScript solutions. Unfortunately, when it was released, it didn’t support a couple of common use cases. Now it does. To ...