GenerateRandomKey method generates the random bytes for given length using `crypto/rand`.

GenerateRandomKeybm method generates the random bytes for given length using `math/rand.Source` and byte mask.

生成随机数字.

IsBlank checks if a string is empty ("") or whitespace.

格式 1076459955600494592.

RandomString method generates the random string for given length using `crypto/rand`.

RandomStringbm method generates the random string for given length using `math/rand.Source` and byte mask.

Remove removes all occurrences of a substring from within the source string.

Repeat returns a new string consisting of count copies of the string s.

Replace returns a copy of the string s with the first n non-overlapping instances of old replaced by new.

时间订单号 年两位，天三位，时分秒6位，毫秒6位 （17位 + 随机数）.