why I get this angle when I export spine.

I have a spine animation. When I export it, angles looks wrong in json file. anyone know why? thanks.

Please check pic1,2

In spine:
Keyframe 0: roate 253.87
Keyframe 1: roate 264.4
Keyframe 2: roate 275

In json file,
{"time":0,"angle":344.98},
{"time":0.2333,"angle":354.6},
{"time":0.4333,"angle":4.41},

Why I export it to json file, keyframe 1 to key frame 2, angle is 4.41 ??
kinda like this? 354.6 + 10 = 364.4

4.41?

Check the JSON format docs:
Spine: JSON export format

rotation: The rotation in degrees of the bone relative to the parent for the setup pose.

The rotations in the JSON are the rotation you keyed minus the setup pose rotation.