Reflow and redraw are two concepts that are often mentioned in front-end development, and they are closely related to web page performance. This article will provide a detailed introduction in terms of definitions, differences and connections, as well as specific code examples.
1. Definition
Reflow refers to the process in which the browser determines the size and position of each element based on the style information after obtaining the rendering tree, and finally generates the web page layout. When the size or position of an element changes or an element is added or deleted, the browser will perform a reflow operation.
Repaint refers to the process of rendering a new layout to the screen based on reflow. When the style of an element is modified without affecting its layout, the browser will redraw it.
2. Differences and connections
The difference between reflow and redraw is mainly reflected in the following aspects:
Although there are obvious differences between reflow and redraw, they also have a certain connection:
3. Specific code examples
// 修改元素的样式属性 element.style.width = '100px'; // 修改元素的尺寸 element.style.height = '200px';
// 修改元素的颜色属性 element.style.color = 'red'; // 修改元素的文本内容 element.innerText = 'Hello World';
It should be noted that in order to avoid excessive reflow and redraw operations, we can use the following optimization techniques:
Summary: Reflow and redrawing are performance issues that need to be paid attention to in front-end development. Understanding their differences, connections, and practical applications can help us optimize the rendering performance of web pages and improve user experience. By reducing the number of reflow and redraw operations, the re-rendering of the page can be effectively reduced and the response speed of the web page can be improved.
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