中文说明：
离散点曲线，进行3次B样条曲线拟合，包括节点参数化过程，基函数计算过程，控制点反求过程，到最后拟合曲线的显示。
English Description：
Discrete point curve, cubic B-spline curve fitting, including node parameterization process, basis function calculation process, control point reverse process, and finally fitting curve display.