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AE弹性动画表达式

amp = .1;
freq = 5;
decay = 7;
n = 0;
if (numKeys > 0){
    n = nearestKey(time).index;
    if (key(n).time > time){
        n--;
    }
}
if (n == 0){
    t = 0;
}else{
    t = time - key(n).time;
}
if (n > 0){
    v = velocityAtTime(key(n).time - thisComp.frameDuration/10);
    value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{
    value;
}

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