Agent Skills
› nexu-io/motion-anything
› gsap-timeline
gsap-timeline
GitHub处理GSAP时间轴动画的技能，涵盖序列编排、位置参数控制、嵌套结构及播放控制。适用于多步动画构建、关键帧协调及用户询问动画顺序或时间轴相关问题时。
触发场景
构建多步骤动画序列
协调多个补间动画的时序与并行关系
使用位置参数精确控制动画触发时机
实现动画时间轴的嵌套与标签管理
控制动画播放、暂停、倒放及进度跳转
安装
npx skills add nexu-io/motion-anything --skill gsap-timeline -g -y
SKILL.md
Frontmatter
{
"name": "gsap-timeline",
"license": "MIT",
"description": "Official GSAP skill for timelines — gsap.timeline(), position parameter, nesting, playback. Use when sequencing animations, choreographing keyframes, or when the user asks about animation sequencing, timelines, or animation order (in GSAP or when recommending a library that supports timelines)."
}
GSAP Timeline
When to Use This Skill
Apply when building multi-step animations, coordinating several tweens in sequence or parallel, or when the user asks about timelines, sequencing, or keyframe-style animation in GSAP.
Related skills: For single tweens and eases use gsap-core; for scroll-driven timelines use gsap-scrolltrigger; for React use gsap-react.
Creating a Timeline
const tl = gsap.timeline();
tl.to(".a", { x: 100, duration: 1 })
.to(".b", { y: 50, duration: 0.5 })
.to(".c", { opacity: 0, duration: 0.3 });
By default, tweens are appended one after another. Use the position parameter to place tweens at specific times or relative to other tweens.
Position Parameter
Third argument (or position property in vars) controls placement:
- Absolute:
1— start at 1 second. - Relative (default):
"+=0.5"— 0.5s after end;"-=0.2"— 0.2s before end. - Label:
"labelName"— at that label;"labelName+=0.3"— 0.3s after label. - Placement:
"<"— start when recently-added animation starts;">"— start when recently-added animation ends (default);"<0.2"— 0.2s after recently-added animation start.
Examples:
tl.to(".a", { x: 100 }, 0); // at 0
tl.to(".b", { y: 50 }, "+=0.5"); // 0.5s after last end
tl.to(".c", { opacity: 0 }, "<"); // same start as previous
tl.to(".d", { scale: 2 }, "<0.2"); // 0.2s after previous start
Timeline Defaults
Pass defaults into the timeline so all child tweens inherit:
const tl = gsap.timeline({ defaults: { duration: 0.5, ease: "power2.out" } });
tl.to(".a", { x: 100 }).to(".b", { y: 50 }); // both use 0.5s and power2.out
Timeline Options (constructor)
- paused: true — create paused; call
.play()to start. - repeat, yoyo — same as tweens; apply to whole timeline.
- onComplete, onStart, onUpdate — timeline-level callbacks.
- defaults — vars merged into every child tween.
Labels
Add and use labels for readable, maintainable sequencing:
tl.addLabel("intro", 0);
tl.to(".a", { x: 100 }, "intro");
tl.addLabel("outro", "+=0.5");
tl.to(".b", { opacity: 0 }, "outro");
tl.play("outro"); // start from "outro"
tl.tweenFromTo("intro", "outro"); // pauses the timeline and returns a new Tween that animates the timeline's playhead from intro to outro with no ease.
Nesting Timelines
Timelines can contain other timelines.
const master = gsap.timeline();
const child = gsap.timeline();
child.to(".a", { x: 100 }).to(".b", { y: 50 });
master.add(child, 0);
master.to(".c", { opacity: 0 }, "+=0.2");
Controlling Playback
- tl.play() / tl.pause()
- tl.reverse() / tl.progress(1) then tl.reverse()
- tl.restart() — from start.
- tl.time(2) — seek to 2 seconds.
- tl.progress(0.5) — seek to 50%.
- tl.kill() — kill timeline and (by default) its children.
Official GSAP Best practices
- ✅ Prefer timelines for sequencing
- ✅ Use the position parameter (third argument) to place tweens at specific times or relative to labels.
- ✅ Add labels with
addLabel()for readable, maintainable sequencing. - ✅ Pass defaults into the timeline constructor so child tweens inherit duration, ease, etc.
- ✅ Put ScrollTrigger on the timeline (or top-level tween), not on tweens inside a timeline.
Do Not
- ❌ Chain animations with delay when a timeline can sequence them; prefer
gsap.timeline()and the position parameter for multi-step animation. - ❌ Forget to pass defaults (e.g.
defaults: { duration: 0.5, ease: "power2.out" }) when many child tweens share the same duration or ease. - ❌ Forget that duration on the timeline constructor is not the same as tween duration; timeline “duration” is determined by its children.
- ❌ Nest animations that contain a ScrollTrigger; ScrollTriggers should only be on top-level Tweens/Timelines.
版本历史
- b016900 当前 2026-07-11 17:11
