How does determine whether the current frame is a Keyframe?

Question

I wrote a simple command that needed to use an if statement to determine the condition. I checked the manual, but I couldn't find an example of judging keyframes.The ideas are as follows: //Select the current frame.
//Condition judgment:
if (if the current frame equals a Keyframe) {
//execute Command 1
} else {
//if the current frame is not a Keyframe, add a Keyframe and execute command 2
}The stupid code I wrote can run, but will make an error in the first frame of the layer.thank you very much!!

kglad · Accepted Answer

var doc = fl.getDocumentDOM();var tl = doc.getTimeline();//Select the current framevar c = tl.currentFrame;// should error check that only one layer is selectedif(c== tl.layers[tl.getSelectedLayers()[0]].frames[c].startFrame){// do whatever}

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