//语法甘露: var object = //定义小写的object基本类,用于实现最基础的方法等 { isA: function(aType) //一个判断类与类之间以及对象与类之间关系的基础方法 { var self = this; while(self) { if (self == aType) return true; self = self.Type; }; return false; } }; function Class(aBaseClass, aClassDefine) //创建类的函数,用于声明类及继承关系 { function class_() //创建类的临时函数壳 { this.Type = aBaseClass; //我们给每一个类约定一个Type属性,引用其继承的类 for( var member in aClassDefine) this[member] = aClassDefine[member]; //复制类的全部定义到当前创建的类 }; class_.prototype = aBaseClass; return new class_(); }; function New(aClass, aParams) //创建对象的函数,用于任意类的对象创建 { function new_() //创建对象的临时函数壳 { this.Type = aClass; //我们也给每一个对象约定一个Type属性,据此可以访问到对象所属的类 if (aClass.Create) aClass.Create.apply( this, aParams); //我们约定所有类的构造函数都叫Create,这和DELPHI比较相似 }; new_.prototype = aClass; return new new_(); }; //语法甘露的应用效果: var Person = Class(object, //派生至object基本类 { Create: function(name, age) { this.name = name; this.age = age; }, SayHello: function() { alert( "Hello, I'm " + this.name + ", " + this.age + " years old."); } }); var Employee = Class(Person, //派生至Person类,是不是和一般对象语言很相似? { Create: function(name, age, salary) { Person.Create.call( this, name, age); //调用基类的构造函数 this.salary = salary; }, ShowMeTheMoney: function() { alert( this.name + " $" + this.salary); } }); var BillGates = New(Person, [ "Bill Gates", 53]); var SteveJobs = New(Employee, [ "Steve Jobs", 53, 1234]); BillGates.SayHello(); SteveJobs.SayHello(); SteveJobs.ShowMeTheMoney(); var LittleBill = New(BillGates.Type, [ "Little Bill", 6]); //根据BillGate的类型创建LittleBill LittleBill.SayHello(); alert(BillGates.isA(Person)); //true alert(BillGates.isA(Employee)); //false alert(SteveJobs.isA(Person)); //true alert(Person.isA(Employee)); //false alert(Employee.isA(Person)); //true