AE弹性表达式_ae怎么让图片跟着视频动

amp = .1; 
freq = 2.0; 
decay = 2.0; 
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}

轻微弹性
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);
amp = .03;
freq = 2.5;
decay = 4.0;
value + vampMath.sin(freqt2Math.PI)/Math.exp(decayt);
}else{
value;
}