Improve web page loading speed: How to reduce the impact of HTML reflow and redraw
With the rapid development of the Internet, web page loading speed has become one of the important indicators of user experience. one. One of the keys to improving web page loading speed is to reduce the impact of HTML reflow and repaint. This article will introduce how to improve the loading performance of web pages by optimizing code and using some techniques to reduce reflows and redraws.
1. What is HTML reflow and redraw
Reflow and redraw are two important processes that occur when the browser renders a web page.
Reflow refers to calculating which elements are displayed on the page based on the geometric properties and layout of DOM elements, and determining their position and size. When a reflow occurs, the browser recalculates and layouts the affected elements and then redraws the entire page.
Redrawing means that when the appearance attributes of a DOM element (such as color, border, etc.) change, the browser will apply the new appearance attributes to the element and redraw it without changing the layout of the element. and location.
The cost of reflow is much higher than that of redrawing, because reflow will cause the entire page to recalculate the layout, while redrawing will only change the appearance attributes of the element. Therefore, in order to improve the loading speed of web pages, we should try to reduce the number of reflows as much as possible.
2. Optimize style
3. Optimize JavaScript
4. Optimize layout
5. Other optimization techniques
Code example:
<!DOCTYPE html> <html> <head> <style> /* 使用class代替style属性 */ .hide { display: none; } .red { color: red; } .animate { transition: transform 0.3s ease; } </style> </head> <body> <!-- 使用CSS3动画代替JavaScript动画 --> <div id="box" class="animate"></div> <script> // 避免频繁操作DOM const box = document.getElementById('box'); box.style.transform = 'translateX(100px)'; box.style.transform = 'scale(0.5)'; </script> </body> </html>
By optimizing styles and JavaScript, as well as reasonable layout and other optimization techniques, we can reduce the impact of HTML reflow and redraw, thereby improving the loading of web pages speed. In actual development, we should choose appropriate optimization strategies according to specific situations to enhance user experience and improve web page loading performance.
The above is the detailed content of Optimize web page performance: reduce the impact of HTML reflow and redraw. For more information, please follow other related articles on the PHP Chinese website!