如果移除log电子秤，则输出相同：
http://www.cs.utsa.edu/~wagner/laws/ALogs.html 还是人家有专业精神： 下面是他的描述： Java supplies a function to calculate natural logs, base e = 2.718281828459045. To calculate logs to other bases, you need to multiply by a fixed constant: for a log base b multiply by 1/logeb ...