CSS过渡和CSS动画有什么区别？

CSS过渡适用于简单的状态变化，而CSS动画用于复杂效果。1. 过渡仅支持开始和结束状态，适用于按钮悬停等简单交互；2. 动画通过关键帧提供完整控制，适合循环播放或精确时序的场景；3. 两者均应优先使用opacity和transform属性以获得最佳性能；4. 应根据需求选择，避免不必要的动画分散用户注意力。

The difference between a CSS transition and a CSS animation comes down to complexity and control. Transitions are for simple, one-off changes—like when you hover over a button and it smoothly changes color. Animations, on the other hand, let you create more complex effects with multiple steps and greater control over timing and behavior.

When to Use a CSS Transition

Transitions work best for short, state-based changes. You define the property you want to change, how long the change should take, and optionally the timing function. They’re ideal for basic interactivity like hover effects or toggling UI elements.

• Simple syntax: Just set transition-property, transition-duration, and optionally transition-timing-function and transition-delay.
• Limited control: Only supports start and end states—no way to define intermediate steps.
• Triggered by state changes: Usually initiated by something like :hover, :focus, or JavaScript toggling a class.

For example, if you have a button that grows slightly when hovered, a transition makes that smooth without needing keyframes or complex code.

When to Use a CSS Animation

Animations give you full control with keyframes. You can loop them, pause, reverse, or even play them in alternate directions. This makes them great for more involved effects like loading spinners, bouncing icons, or animated sliders.

• Keyframe-based: Define each step using @keyframes, from 0% to 100%.
• More flexibility: You can repeat animations, control playback direction, delay start time, and even make them fill forwards or backwards in time.
• Independent of user interaction: Can run automatically on page load or be triggered by events.

If you're building a loader that spins continuously or animating a character walking across the screen, an animation is the right choice.

Performance and Practical Considerations

Both transitions and animations can be hardware-accelerated, but not all properties animate well. Stick to animating opacity and transform for the smoothest performance. Avoid animating layout-triggering properties like width, height, or margin unless absolutely necessary.

• Use transitions for small UI feedback, like buttons, tooltips, or dropdowns.
• Use animations for more complex visual sequences, especially those needing looping or precise timing.

Also, remember that just because you can animate something doesn’t mean you should. Keep things subtle and purposeful to avoid distracting users.

基本上就这些。

以上是CSS过渡和CSS动画有什么区别？的详细内容。更多信息请关注PHP中文网其他相关文章！