lua 中的操作系统库(国外英语资料).doc

lua 中的操作系统库(国外英语资料) Operating system libraries in Lua This library is implemented in table OS Os.clock () Function: returns a program that uses an approximation of the CPU time Such as: Local x = os.clock (); Print (os.clock ()) Local s = 0; For I = 1, 100000000 do S = S + i; End Print (string.format (elapsed time:%.2f\n, os.clock () - x); Output: Elapsed time: 2.55 -------------------------------------------------------------------------------- Os.date ([format [[time]]]) Function: returns a string or table that formats the date and time by format If you set the time parameter, format at the time specified by time, or format at the current time Parameter: Format: : formatted according to Greenwich time. *t: will return one with year (4 bits), month (1-12), day (1--31), hour (0-23), min (0-59) sec (0-61), WDAY (week, Sunday, 1), yday (number of days in the year), and, isdst (whether for daylight saving time true/false) with the name of the table; if there is no string *t returns a strftime function according to C format If no parameters, according to the current system of the os.date string set (os.date) = return formatted (%c) Such as: T = os.date (*t, os.time ()); For, I, V, in, pairs (T) do Print (I, V); End Output: Hour 14 Min 58 WDAY 2 Day 10 Month 8 Year 2009 SEC 18 Yday 222 Isdst false For other formatting strings, os.date formats the date into a string Such as: Print (os.date (today, is,%A,%B, in)) --today, is, Tuesday, in, May Print (os.date (%x, 906000490)) --09/16/1998 All formatted strings are as follows: %a the number of days in a week (Wed) %A the full number of days in a week (Wednesday) %b (Sep) Full name for%B months (September) %c date and time (09/16/98, 23:48:10) %d the first few days of the month (16) [0 ~ 31] The number of hours in%H 24 hours (23) [00 ~ 23] The number of hours in%I 12 hours (11) [01 ~ 12] %j the first few days of the year (259) [01 to 366] %M minutes (48) [00 to 59] %m months (09) [01 to 12] %P morning (AM) or afternoon (PM) (