IsDebug determines whether the current environment is `DEBUG` through the `DEBUG` variable in the current environment variables.

MustToConsoleAndFile returns an `io.Writer` that can both output the log to a control or terminal emulator and save the log to a local file, which will panic if there is an error opening the file.

MustToFile returns an `io.Writer` that saves the log to a local file and will panic if there is an error opening the file.

NewLogger returns a new `Logger` pointer.

ToConsole returns an `io.Writer` that outputs the log to the console or terminal emulator or an `error`.

ToConsoleAndFile returns an `io.Writer` that can both output the log to a control or terminal emulator and save the log to a local file, or an `error`.

ToFile returns an `io.Writer` that saves the log to a local file or an `error`.

log level.

log level.

log level.

log level.

log level.

Console default time format with millisecond accuracy.

Default time format with nanosecond precision.

Arg records the parameters required in the log as key-value pairs, the key is of type `string`, and the value can be of any type.

Logger records a `zerolog.Logger` pointer and uses this pointer to implement all logging methods.

Level defines the log level.