要實現(xiàn)網(wǎng)頁動畫的高性能，應(yīng)優(yōu)先使用transform和opacity屬性，避免觸發(fā)佈局重排的屬性。 1. transform（如translate、scale、rotate）和opacity變化通常由GPU加速，僅需合成操作，不觸發(fā)佈局或重繪；2. 避免動畫化width、height、top、left等佈局相關(guān)屬性，防止引發(fā)佈局抖動；3. 可適當(dāng)使用will-change或translateZ(0)提升元素為獨立圖層，但不宜過多；4. 控制動畫複雜度，減少同時動畫元素數(shù)量，優(yōu)選CSS過渡而非JavaScript驅(qū)動，並在需要時使用requestAnimationFrame進(jìn)行控制。

當(dāng)you're animating elements on a webpage, not all CSS properties are created equal. Some will run smoothly and look great, while others can cause jank and slow things down. If you want your animations to feel snappy and not hurt performance, it's best to stick with properties that the browser can handle efficiently — ideally ones that only require compositing changes, not layout or paint.

Here's what to focus on if you care about smooth animation performance.

Use transform and opacity for smooth animations

These two properties are the gold standard when it comes to high-performance animations. Why? Because they can often be handled by the GPU through something called hardware acceleration , without triggering expensive layout or paint operations.

• transform : This includes things like translate , scale , rotate , and skew . For example, moving an element with transform: translateX(100px) is much smoother than changing its left or margin-left value.

• opacity : Changing transparency also doesn't force the browser to recalculate layout or repaint large parts of the screen.

A quick tip: Try combining both for effects like fading and sliding in menus or tooltips.

Avoid animating layout-triggering properties

Some properties cause the browser to recalculate layout every frame — this is known as layout thrashing and can make your animation stutter.

Avoid animating:

• width , height
• top , left , margin , padding
• border-width

These kinds of changes force the browser to re-measure how much space everything takes up, which is computationally heavy when done repeatedly in an animation loop.

For example, animating width to make a progress bar grow might seem simple, but using a transform: scaleX() instead will usually give better results.

Stick to composited animations where possible

When you animate a property that triggers the compositor (part of the browser engine responsible for putting together the final screen image), things tend to run faster.

You can help the browser optimize by:

• Using will-change or translateZ(0) sparingly to promote elements to their own layer
• Not overdoing it with layers — too many can actually hurt performance

This kind of optimization isn't always needed, but it can help in complex UIs or mobile devices where resources are more limited.

Keep animation complexity under control

Even with well-chosen properties, animations can still get heavy if:

• They run on many elements at once
• They use complex easing curves or long durations
• They trigger callbacks or JavaScript during the animation

To keep things light:

• Limit how many elements are animated at once
• Prefer CSS-only transitions over JavaScript-driven animation
• Use requestAnimationFrame if you need JS control

Also, test your animations on lower-end devices — just because it's buttery smooth on your laptop doesn't mean it will be on a phone from a few years ago.

Performance-friendly animation is mostly about choosing the right tools and knowing what causes extra work behind the scenes. Stick with transform and opacity most of the time, avoid layout-hurting properties, and keep things simple.基本上就這些。

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