'use strict';

(function(){

    if(!Object.getOwnPropertyNames){

        console.log('浏览器不支持getOwnPropertyNames');

        return;

    }

    //人类的构造函数

    var person = function(name, age, sex){

        this.name = name;

        this.age = age;

        this.sex = sex;

        this.sing = function(){

            console.log('sing');

        }

    }

    //new 一个ladygaga

    var gaga = new person('ladygaga', 26, 'girl');

    //给嘎嘎发放一个不可枚举的身份证

    Object.defineProperty(gaga, 'id', {

        value : '1234567890',

        enumerable : false

    });

    //查看gaga的个人信息

    var arr = Object.getOwnPropertyNames(gaga);

    document.write(arr); //output: name,age,sex,sing,id

    document.write('</br>');

    
　　 //注意和getOwnPropertyNames的区别，不可枚举的id没有输出

    var arr1 = Object.keys(gaga);

    document.write(arr1); //output: name,age,sex,sing

})();