//简单对象的属性的变化监控//通过setAttr改变属性的值varo={'a':2,'b':3};functionwatch(obj,attr,callback){if(typeofobj.defa
//简单对象的属性的变化监控//通过setAttr改变属性的值var o = { 'a':2, 'b':3};function watch(obj, attr, callback){ if(typeof obj.defaultValues == 'undefined'){ obj.defaultValues = {}; for(var p in obj){ if(typeof obj[p] !== 'function' && typeof obj[p] !== 'object') obj.defaultValues[p] = obj[p]; } } if(typeof obj.setAttr == 'undefined'){ obj.setAttr = function(attr, value){ if(this[attr] != value){ this.defaultValues[attr] = this[attr]; this[attr] = value; return callback(this); } return this; }; } }watch(o, 'a', function(obj){ console.log(obj);});o.setAttr('a',4);