# Packages
*
* sync.Pool是一个可以存或取的临时对象集合; 可以安全被多个线程同时使用，保证线程安全;sync.Pool中保存的任何项都可能随时不做通知的释放掉，所以不适合用于像socket长连接或数据库连接池。
* sync.Pool主要用途是增加临时对象的重用率，减少GC负担。
*/.
# Functions
CacheDir 缓存.
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GetUUID generates a UUID/GUID (version 1 format) using the satori/go.uuid package.
GetUUIDv4 generates a UUID/GUID (version 4 format) using the satori/go.uuid package.
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String supply rand string.
StringWithCharset support rand string you defined.
# Constants
Alphabetic is \w+ \W.
Alphanumeric contain Alphabetic and Numeric.
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Hex is Hexadecimal.
Numeric is number list.
# Type aliases
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StringSlice ...