从axes中获取QuadMesh对象创建colorbar
import matplotlib.pyplot as plt
fun(coordinate_x_system, coordinate_y_system, axes, value)
axes.pcolormesh(coordinate_x_system, coordinate_y_system, value, shading='gouraud')
current_cbar = plt.colorbar(axes.collections[0], ax=[axes], extend='both')
return current_cbar