FileHandler 写入文件handler.

Setup change the log config immediately The lv is higher the more logs would be visible.

TerminalFormat formats log records optimized for human readability on a terminal with color-coded level output and terser human friendly timestamp.

滚动日志文件数.

64M.

TerminalStringer is an analogous interface to the stdlib stringer, allowing own types to have custom shortened serialization formats when printed to the screen.

Lazy allows you to defer calculation of a logged value that is expensive to compute until it is certain that it must be evaluated with the given filters.