ceph/src/civetweb/src/third_party/duktape-1.5.2/polyfills/performance-now.js

   1 /*
   2  *  Performance.now() polyfill
   3  *
   4  *  http://www.w3.org/TR/hr-time/#sec-high-resolution-time
   5  *
   6  *  Dummy implementation which uses the Date built-in and has no higher
   7  *  resolution.  If/when Duktape has a built-in high resolution timer
   8  *  interface, reimplement this.
   9  */
  10
  11 var _perfNowZeroTime = Date.now();
  12
  13 if (typeof Performance === 'undefined') {
  14     Object.defineProperty(this, 'Performance', {
  15         value: {},
  16         writable: true, enumerable: false, configurable: true
  17     });
  18 }
  19 if (typeof Performance.now === 'undefined') {
  20     Object.defineProperty(Performance, 'now', {
  21         value: function () {
  22             return Date.now() - _perfNowZeroTime;
  23         }, writable: true, enumerable: false, configurable: true
  24     });
  25 }