这个是用于拟合幂律分布的函数。函数使用最大似然估计方法估计幂律分布。另外给出了如何调用其函数的形式，更全面和更具指导性，经验证效果非常好。-This is used to fit power-law distribution function. The function uses the maximum likelihood estimation method to estimate the power-law distribution. Another form of how to call the function, more comprehensive and more guidance, proven very good.