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cross-platform-object.watch.js

object.watch polyfill by Eli Grey

بۇ قوليازمىنى بىۋاسىتە قاچىلاشقا بولمايدۇ. بۇ باشقا قوليازمىلارنىڭ ئىشلىتىشى ئۈچۈن تەمىنلەنگەن ئامبار بولۇپ، ئىشلىتىش ئۈچۈن مېتا كۆرسەتمىسىگە قىستۇرىدىغان كود: // @require https://update.greatest.deepsurf.us/scripts/5908/22033/cross-platform-objectwatchjs.js 

  1. /*
  2.  * object.watch polyfill
  3.  *
  4.  * 2012-04-03
  5.  *
  6.  * By Eli Grey, http://eligrey.com
  7.  * Public Domain.
  8.  * NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
  9.  */
  10.  
  11. // object.watch
  12. if (!Object.prototype.watch) {
  13. 	Object.defineProperty(Object.prototype, "watch", {
  14. 		  enumerable: false
  15. 		, configurable: true
  16. 		, writable: false
  17. 		, value: function (prop, handler) {
  18. 			var
  19. 			  oldval = this[prop]
  20. 			, newval = oldval
  21. 			, getter = function () {
  22. 				return newval;
  23. 			}
  24. 			, setter = function (val) {
  25. 				oldval = newval;
  26. 				return newval = handler.call(this, prop, oldval, val);
  27. 			}
  28. 			;
  29. 			
  30. 			if (delete this[prop]) { // can't watch constants
  31. 				Object.defineProperty(this, prop, {
  32. 					  get: getter
  33. 					, set: setter
  34. 					, enumerable: true
  35. 					, configurable: true
  36. 				});
  37. 			}
  38. 		}
  39. 	});
  40. }
  41.  
  42. // object.unwatch
  43. if (!Object.prototype.unwatch) {
  44. 	Object.defineProperty(Object.prototype, "unwatch", {
  45. 		  enumerable: false
  46. 		, configurable: true
  47. 		, writable: false
  48. 		, value: function (prop) {
  49. 			var val = this[prop];
  50. 			delete this[prop]; // remove accessors
  51. 			this[prop] = val;
  52. 		}
  53. 	});
  54. }