AbsInt16 gets absolute value of int16.

AbsInt32 gets absolute value of int32.

AbsInt64 gets absolute value of int64.

AbsInt8 gets absolute value of int8.

保留N位小数.

int数组合并，去重复.

RandAlphanumeric returns a truly random string of the specified length and the contents of which are composed of alphanumeric letters.

RandBytes gets a truly random byte slice of the specified length with the value range in [0x00,0xff].

RandInt returns a non-negative truly random int number.

RandIntn returns a non-negative truly random int number in [0,n).

RandIntRange returns a non-negative truly random int number in [min,max).

RandInts returns a non-negative truly random int specified length slice with the value range in [0,max).

RandLowerStr returns a truly random lowercase string of a specified length.

随机值在闭区间[min,max].

打乱一个string数组.

打乱一个uint数组.

RandStr returns a truly random string of the specified length and the contents of which are composed of upper and lowercase letters.

RandUpperStr returns a truly random uppercase string of a specified length.