29 lines
863 B
JavaScript
29 lines
863 B
JavaScript
define(function() {
|
|
'use strict';
|
|
/*global performance*/
|
|
|
|
/**
|
|
* Gets a timestamp that can be used in measuring the time between events. Timestamps
|
|
* are expressed in milliseconds, but it is not specified what the milliseconds are
|
|
* measured from. This function uses performance.now() if it is available, or Date.now()
|
|
* otherwise.
|
|
*
|
|
* @exports getTimestamp
|
|
*
|
|
* @returns {Number} The timestamp in milliseconds since some unspecified reference time.
|
|
*/
|
|
var getTimestamp;
|
|
|
|
if (typeof performance !== 'undefined' && typeof performance.now === 'function' && isFinite(performance.now())) {
|
|
getTimestamp = function() {
|
|
return performance.now();
|
|
};
|
|
} else {
|
|
getTimestamp = function() {
|
|
return Date.now();
|
|
};
|
|
}
|
|
|
|
return getTimestamp;
|
|
});
|