Optimize user experience: improve web page redrawing and reflow issues to ensure interface smoothness

Ultimate user experience: Solving page redrawing and reflow, allowing users to experience a smooth interface, requiring specific code examples

With the rapid development of the Internet, users have The experience requirements of web pages are also increasing day by day. A smooth and responsive interface tends to win over more users. In web design, reducing page redraws and reflows is an important part of improving user experience.

What are page redrawing and reflow? Simply put, redrawing means that when the element style changes, the browser will recalculate and draw the appearance of the element. Reflow means that when the size, position and other attributes of the element change, the browser needs to recalculate the position of the element on the page. layout in and then redraw. Redrawing and reflowing will take up a lot of computing resources, causing the page to become slow and stuck, affecting the user's operating experience.

So how to solve the redrawing and reflow of the page? Below we will explain through specific code examples.

1. Use CSS3 animations instead of JavaScript animations

JavaScript animations often trigger reflow operations because they may change the position and size of elements. Using CSS3 animation properties (such as transform and opacity) can achieve animation effects without triggering reflow, thereby improving page performance.

The following is a sample code:

<div class="box"></div>

<style>
.box {
  width: 100px;
  height: 100px;
  background-color: red;
  transition: transform 0.3s;
}

.box:hover {
  transform: scale(1.2);
}
</style>

In the above code, when the mouse hovers over the box element, the element will be scaled by 1.2 times, and this The scaling animation is implemented through the transition property of CSS3, not through JavaScript.

2. Use the requestAnimationFrame method to optimize animation

requestAnimationFrame is a method provided by the browser to optimize animation performance. It will be executed before each frame is rendered to ensure smooth animation and minimize lag.

The following is a sample code:

function animate() {
  // 动画逻辑
  requestAnimationFrame(animate);
}

animate();

In the above code, we implement a basic animation loop by recursively calling requestAnimationFrame. Animation logic can be placed in the animate function.

3. Use the will-change attribute of CSS3 to optimize the animation effect of the element

The will-change attribute of CSS3 can be advanced Tells the browser that an element will change soon, allowing the browser to optimize its rendering performance. We can set the will-change property before the animation starts to reduce reflow operations.

Here is a sample code:

<div class="box"></div>

<style>
.box {
  width: 100px;
  height: 100px;
  background-color: red;
  will-change: transform;
}

.box:hover {
  transform: scale(1.2);
}
</style>

In the above code, we set the will-change attribute on the box element and tell The attribute that the browser will change for this element is transform, thus optimizing the animation effect of element scaling.

Through the above code examples, we can see that by using CSS3 animation, requestAnimationFrame method and will-change attribute, we can effectively solve the problem of page duplication. Drawing and reflow issues can be solved to improve the user experience. In actual development, we can also combine other optimization methods, such as lazy loading of images, caching mechanisms, etc., to further improve the performance of the page.

To sum up, there are many ways to solve page redrawing and reflow. We need to choose the appropriate optimization method according to the specific business scenario. Through continuous optimization and improvement, we can provide users with a smoother and more responsive interface and enhance the ultimate user experience.

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