1.工厂模式

function createPerson(name, age, job) {            var o = new Object();            o.name = name;            o.age = age;            o.job = job;            o.sayName = function () {                alert(this.name);            };            return o;        }        var person1 = createPerson("Nicholas", 29, "Software Engineer");        var person2 = createPerson("Greg", 62, "Doctor");

2.构造函数模式

function Person(name, age, job) {            this.name = name;            this.age = age;            this.job = job;            this.sayName = function () {                alert(this.name);            };        }        var person1 = new Person("Nicholas", 29, "Software Engineer");        var person2 = new Person("Greg", 62, "Doctor");        //与工厂模式的不同点        //1.没有显示创造对象        //2.直接将属性和方法赋值给this        //3.没有return语句        //4.使用new创造对象        //使用方式        //1.当做构造函数使用        var person = new Person("Nicholas", 29, "Software");        person.sayName();//Nicholas        //2.作为普通函数调用        Person("Yellow", 27, "Doctor");        window.sayName();//Doctor        //3. 在另一个对象的作用域中调用        var o = new Object();        Person.call(o, "King", 25, "Nurse");        o.sayName();//King                //缺点:每个方法都要在每个实例上重新创建一遍

3.原型模式

function Person() {        }        Person.prototype.name = "Yellowshorts";        Person.prototype.age = 29;        Person.prototype.job = "Software";        Person.prototype.sayName = function () {            alert(this.name);        }        var person1 = new Person();        person1.sayName();//Yellowshorts        var person2 = new Person();        person2.sayName();//Yellowshorts        alert(person1.sayName == person2.sayName);//true