1. 創建對象的幾種方式

/**
 * 普通方式
 */

var obj = {};
obj.name = ‘XingyaZhao‘;
obj.age = 23;
obj.intro = function () {
    return "My name is " + this.name + ", and I‘m " + this.age + ".";
};

alert(obj.intro());

/**
 * 工廠模式
 */

function createObject(name,age) {
    var obj = {};
    obj.name = name;
    obj.age 
 
= age;
    obj.intro = function () {
        return "My name is " + this.name + ", and I‘m " + this.age + ".";
    };
    return obj;
}

var obj1 = createObject(‘XingyaZhao‘,23);
var obj2 = createObject(‘HailinWang‘,22);
alert(obj1.intro());
alert(obj2.intro());

/**
 * 構造函數方式
 */

function Person(name, age) {
    
 
this.name = name;
    this.age = age;
    this.intro = function() {
        return "My name is " + this.name + ", and I‘m " + this.age + ".";
    };
}

var zhao = new Person(‘XingyaZhao‘,23);
var wang = new Person(‘HailinWang‘,22);
alert(zhao.intro());
alert(wang.intro());

構造函數方式與工廠模式的區別

1.構造函數沒有new Object，但它後臺會自動var obj = new Object
2.this就相當於obj
3.構造函數不需要返回對象引用，它是後臺自動返回的


構造函數方式的規範
 


1.構造函數也是函數，但函數名第一個字母大寫
2.必須通過 new 構造函數名() 來創建對象，new Person()

ES5 - 面向對象編程