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(The discrete point curve is fitted with 3 B spline curves, including the node parameterization process, the basis function calculation process, the control point inversion process, and the final fitting curve display)