javascript创建对象的几种常见方法

//直接实例化一个对象

var Person1 = { Name: "梦在旅途", Age: 29, Sex: "男", Height: 178 };

alert(Person1.Name);

var Person2 = new Object();

Person2.Name = "梦在旅途";

Person2.Age = 29;

Person2.Sex = "男";

Person2.Height = 178;

alert(Person2.Name);

//这个是上面的简写

var Person3 = new Object({ Name: "梦在旅途", Age: 29, Sex: "男", Height: 178 });

alert(Person3.Name);

//先定义类，再实例化成对象

function Person4(n,a,s,h) {

    this.Name = n;

    this.Age = a;

    this.Sex = s;

    this.Height = h;

}

var p4 = new Person4("梦在旅途", 29, "男", 178);

alert(p4.Age);

function Person5(n, a, s, h) {

    //公共属性

    this.Name = n;

    this.Age = a;

    this.Sex = s;

    this.Height = h;

    //公共方法

    this.AfterYear = function (count) {

        updateAge(count);

        alert(_currentYear +"后，我已经：" + this.Age +"岁了！");

    };

    this.Say = function () {

        alert("我的个人信息－－> Name: "+ this.Name+", Age: "+ this.Age +", Sex: "+ this.Sex +", Height:" + this.Height);

    }

    //私有属性与方法

    var _self = this;

    var _currentYear = 2015;

    function updateAge(count) {

        _currentYear += count;

        _self.Age += count;

    };

}

var p5 = new Person5("梦在旅途", 29, "男", 178);

p5.AfterYear(10);

p5.AfterYear(25);

function SoftEngineer(n, a, s, h, lang) {

    Person5.call(this, n, a, s, h);//将Person5的所有属性与方法包含到SoftEngineer中，从而实现继承

    this.Lang = lang;

    this.SayCode = function () {

        alert("我是一名软件工程师，我会" + this.Lang + "编程语言！");

    }

    this.Working = function () { };//空方法，类似面向对象中的虚方法

}

SoftEngineer.prototype = new Person5(); //将SoftEngineer的原型指定Person5的实例

var softengr = new SoftEngineer("梦在旅途", 29, "男", 178, "javascript");

softengr.Say();

softengr.SayCode();

function WebSoftEngineer(n, a, s, h, lang) {

    SoftEngineer.apply(this, [n, a, s, h, lang]);

    this.Working = function () {

        alert("我是网页工程师，从事网页开发设计工作！");

    };

};

WebSoftEngineer.prototype = new SoftEngineer();

function AppSoftEngineer(n, a, s, h, lang) {

    SoftEngineer.apply(this, [n, a, s, h, lang]);

    this.Working = function () {

        alert("我是应用工程师，从事客户端应用程序开发设计工作！");

    };

};

AppSoftEngineer.prototype = new SoftEngineer();

var webengr = new WebSoftEngineer("梦在旅途", 29, "男", 178, "javascript");

webengr.Say();

webengr.Working();

var appengr = new AppSoftEngineer("梦在旅途", 29, "男", 178, "c#");

appengr.Say();

appengr.Working();