Observe changes on object properties.
Ezt a szkriptet nem ajánlott közvetlenül telepíteni. Ez egy könyvtár más szkriptek számára, amik tartalmazzák a // @require https://update.greasyfork.org/scripts/5314/20683/objectwatch.js hivatkozást.
/*
* object.watch polyfill
*
* 2012-04-03
*
* By Eli Grey, http://eligrey.com
* Public Domain.
* NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
*
*/
// object.watch
if (!Object.prototype.watch) {
Object.defineProperty(Object.prototype, "watch", {
enumerable: false,
configurable: true,
writable: false,
value: function(prop, handler) {
var oldval = this[prop],
newval = oldval,
getter = function() {
return newval;
},
setter = function(val) {
oldval = newval;
return newval = handler.call(this, prop, oldval, val);
};
if (delete this[prop]) { // can't watch constants
Object.defineProperty(this, prop, {
get: getter,
set: setter,
enumerable: true,
configurable: true
});
}
}
});
}
// object.unwatch
if (!Object.prototype.unwatch) {
Object.defineProperty(Object.prototype, "unwatch", {
enumerable: false,
configurable: true,
writable: false,
value: function(prop) {
var val = this[prop];
delete this[prop]; // remove accessors
this[prop] = val;
}
});
}