- PrintTable()
- print the k and v of a table.
- core.debug([debugLevel], ...)
- output debug log
- without debuglevel, the logdefault flag determine if this works.
- code.debuglevel(, [logdefault])
- set debug level and logdefault flag.
- set logdefault to -1 means default will be ignored, 1 or 0 will be loged.