as the scale of the React application we develop is getting larger and larger, if all the components are still packaged into one bundle file, it may cause the application to load slowly. It is a common practice to package the components in the program into separate files to reduce the load time of the application, which is usually achieved by "loading on demand". In this article, you will learn about the dynamic import of components in React programs. 1.roomnbsp; what is a dynamic import component? dynamic import components refer to loading components when needed, rather than packaging all components into a single bundle file when the application loads. How do we implement it in React? React provides us with a & nbsp; lazy () & nbsp; method and & nbsp; Suspense & nbsp; component, which are the two main tools for dynamically importing components. using & nbsp; React.lazy () , we can easily load components on demand. The syntax is as follows: const MyComponent = React.lazy(() => import('./MyComponent')); in the code above, React.lazy () & nbsp; receives a function that returns a & nbsp; import () & nbsp; function call. import () & the nbsp; function is part of the ECMAScript dynamic import syntax, which allows us to load a module asynchronously at run time. By combining the & nbsp; React.lazy () & nbsp; with the & nbsp; import () & nbsp; function, we can load components on demand. when we use & nbsp; React.lazy () & nbsp;, React automatically wraps the returned component in a & nbsp; lazy…
how to optimize the performance of web pages? For front-end performance optimization, here are five tips for improving website loading speed: compress and merge files: compress HTML, CSS, JavaScript, and then merge them to reduce HTTP requests. Latency loading: loads content only when needed. lazy loading: images and other media are loaded only when the user scrolls the page. use caching: use browser caching to reduce resource loading time. compressed images: use compressed image formats, such as JPEG, to reduce file size and speed up loading. 1. Compress and merge files you can use tools and plug-ins (such as Gulp, Grunt, Webpack, and so on) to automatically compress and merge files. HTML compression: <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>HTML compression exampl</title> </head> <body> <h1>This is the title.</h1> <p>This is a passage.</p> </body> </html> CSS compression: body { background-color: #f8f8f8; font-family: Arial, sans-serif; font-size: 16px; } h1 { color: #333; font-size: 28px; } p { color: #666; font-size: 18px; } JavaScript compression: (function() { var message = "Hello World!"; console.log(message); }()); 2. Delayed loading delayed loading can be achieved using JavaScript. <img data-src="image.jpg" alt="Picture"> <script> // wait for the page to be fully loaded before executing the script window.onload = function() { // get all picture tags var images = document.querySelectorAll('img[data-src]'); // traversing the picture tag Array.prototype.forEach.call(images, function(image) { // modify src image.setAttribute('src', image.getAttribute('data-src')); }); }; </script> 3. Lazy load lazy loading can be implemented using JavaScript and plug-ins. Here we use the jQuery plug-in to implement lazy loading. <img data-src="image.jpg" alt="Picture"> <script src="https://code.jquery.com/jquery-3.5.1.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.lazyload/1.9.1/jquery.lazyload.min.js"></script> <script> $(function() { $("img").lazyload({…
