Yaoxiao1

> You can use [`set_max_level`](https://docs.rs/log/latest/log/fn.set_max_level.html) to change the log level at runtime. @Thomasdezeeuw Hi, I ran the test code above, the max_level did changed, but the filter remains the same,...

> For example setting the `max_level_warn` feature removes all trace, debug and info logs. yes, that's correct, I changed the filter level at compile time, then the runtime level can...