the time function to use for your Stopwatch instance.
it is best if it returns the time in milliseconds, so that the time scale can be consistient across various uses.
"perf" is equivalent to using the built-in performance.now function. (default)
"date" is equivalent to using the built-in Date.now function.
alternatively, you could define your own time function.
the time function to use for your Stopwatch instance. it is best if it returns the time in milliseconds, so that the time scale can be consistient across various uses.
"perf"is equivalent to using the built-inperformance.nowfunction. (default)"date"is equivalent to using the built-inDate.nowfunction.