JS创建对象的方式

1.函数模拟类

function Box() {
	//公开属性使用this来声明
	this.name = "mike"; //重点是this
	this.sex = "male";
	this.age = 12;
	this.fun = function() {
		console.log("hello");
	}

	//不使用this的就是私有属性或方法。
	var ivar = "ivar";
}
Box.prototype.protofunc = function(first_argument) {
	console.log(first_argument);
};
Box.prototype.protovar = "hi,protovar";

var obj1 = new Box();
console.log(obj1.name);
console.log(obj1.sex);
console.log(obj1.age);
obj1.fun();
console.log(obj1.ivar); //私有属性，不可见
obj1.protofunc("hi,proto");
console.log(obj1.protovar);

/*output:
mike
male
12
hello
undefined
hi,proto
hi,protovar
*/

2.Object create，对象模拟类

var Cox = {
	name: "mike",
	sex: "male",
	age: 12,
	fun: function() {
		console.log("hello");
	}
}

var obj2 = Object.create(Cox);
console.log(obj2.name);
console.log(obj2.sex);
console.log(obj2.age);
obj2.fun();

/*output:
mike
male
12
hello
*/

3.极简风，推荐

var Dox = {
	createNew: function() {
		var dox = {};
		var ivar; //私有
		dox.name = "hi";
		dox.makeSound = function() {
			console.log("hello world!")
		};
		return dox;
	}
};

var dox = Dox.createNew();
dox.makeSound();

//3.1 继承
var Doxer = {
	createNew : function () {
		var doxer = Dox.createNew();//继承
		doxer.helloDoxer = "helloDoxer"; 
		return doxer;
	}
}
var doxer = Doxer.createNew();
console.log(doxer.helloDoxer);
console.log(doxer.name);

//output:
/*
hello world!
helloDoxer
hi
*/