JS中创建对象的几种模式

/**
 * Created by sibuk on 2017/6/5.
 */

//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", 27, "Doctor");

person1.sayName(); //"Nicholas"
person2.sayName(); //"Greg"

//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", 27, "Doctor");

person1.sayName(); //"Nicholas"
person2.sayName(); //"Greg"

//原型模式
function Person(){

}

Person.prototype.name = "Nicholas";
Person.prototype.age = 29;
Person.prototype.job = "software Engineer";
Person.prototype.sayName = function() {
    alert(this.name);
}

var person1 = new Person();
person1.sayName(); //"Nicholas"

var person2 = new Person();
person2.sayName(); //"Nicholas"

alert(person1.sayName == person2.sayName); //true

//组合使用构造函数模式和原型模式
function Person( name, age, job ) {
    this.name = name;
    this.age = age;
    this.job = job;
    this.friends = ["Shelby","Court"];
}

Person.prototype = {
    constructor: Person,
    sayName: function(){
        alert(this.name);
    }
}

var person1 = new Person("Nicholas", 29, "software Engineer");
var person2 = new Person("Greg", 27, "Doctor");

person1.friends.push("Van");

alert(person1.friends); //"Shelby,Court,Van"
alert(person2.friends); //"Shelby,Court"
alert(person1.friends === person2.friends); //false
alert(person1.sayName === person2.sayName); //true

//动态原型模式
function Person( name, age, job ) {
    //属性
    this.name = name;
    this.age = age;
    this.job = job;

    //方法
    if( typeof this.sayName != "function" ) {
        Person.prototype.sayName = function() {
            alert(this.name);
        }
    }
}

var person = new Person("Nicholas", 29, "software Engineer");
person.sayName();

//寄生构造函数模式
function SpecialArray() {
    //创建数组
    var values = new Array();

    //添加值
    values.push.apply(values,arguments);

    //添加新方法
    values.toPipedString = function(){
        return this.join("|");
    };

    //返回数组
    return values;
}

var colors = new SpecialArray("red","blue","green");
alert(colors.toPipedString()); //"red|blue|green"

//稳妥构造函数模式
function Person( name, age, job ) {
    //创建要返回的对象
    var o = new Object();

    //可以在这里定义私有变量和函数

    //添加方法
    o.sayName = function() {
        alert(name);
    };

    //返回对象
    return o;
}

var person = Person("Nicholas", 29, "software Engineer");
Person.sayName(); //"Nicholas"