/* -- 封装 -- */

var _packaging = function() {

//私有属性和方法

var age = "12";

var method1 = function() {

//...

}

//特权属性和方法(1.可以被实例访问 2.不能被类访问 3.可以访问私有属性)

this.title = 'JavaScript Design Patterns';

this.getAge = function() {

console.log(age);

return age;

}

}

//共有静态属性和方法(1.可以被类访问 2.不能被实例访问)

_packaging._age = '15';

_packaging.alertAge = function() {

alert(_packaging._age);

}

//共有属性和方法(1.可以被实例访问 2.不能被类访问 3.不可以访问私有属性)

_packaging.prototype = {

sex:"male",

init: function() {

console.log(age);

}

}

console.log(_packaging.age);//undefined

console.log(_packaging.title);//undefined

console.log(_packaging._age);//15

console.log(_packaging.sex);//undefined

var abc = new _packaging();

console.log(abc.age);//undefined

console.log(abc.title);//JavaScript Design Patterns

console.log(abc._age);//undefined

console.log(abc.sex);//male

abc.getAge();//12

abc.init();//age is not defined