[cocos creator 3.5.1] addition of coordinates

Usage method

Vec3.add(this._targetPos, this._curPos, new Vec3(this._jumpStep, 0, 0));

describe

(method) math.Vec3.add<Vec3>(out: Vec3, a: math.IVec3Like, b: math.IVec3Like): Vec3
@en — Element-wise vector addition and save the results to out vector object

@zh —  Element by element vector addition 

Pass in three Vec3 Type variable , The first one is the output Vec3.