JavaScript 构造器模式与模块模式详解

// 使用函数来模拟一个Car类
function Car(model,year,miles) {
	this.model = model ;
	this.year = year;
	this.miles = miles;

	this.toString = function () {
		return this.model + "已经行驶了" + this.miles + "米";
	}
}

//调用
var honda = new Car("东风Honda",2009,20000);//实例化Car

//输出结果
console.log(honda.toString());

function Car(model,year,miles) {
	this.model = model ;
	this.year = year;
	this.miles = miles;

	//每个对象都有构造器原型的所有属性。
	Car.prototype.toString = function() {
		return this.model + "已经行驶了" + this.miles + "米";
	}
}
//调用
var honda = new Car("东风Honda",2009,20000);//实例化Car
console.log(honda.toString());

<script type="text/javascript">
    const myObjectLiteral = {
        varibaleKey : varibaleValue,
        function: function () {
                //实现
        }
    };
</script>

<script type="text/javascript">
	const basketModule = (function() {
		//私有
		let baskey = [];
		function doSomethingPrivate () {
			//实现
		}
		function doSomethingElsePrivate() {
			//实现
		}
		//返回一个暴露出的公有对象API
		return {
			//添加item到购物车
			addItem: function (values) {
				basket.push(values);
			},
			//获取购物车里的item数
			getItemCount: function() {
				return basket.length;
			},
			//私有函数的公有形式别名
			doSomething: doSomethingPrivate,
			//获取购物车里所有item的价格总值
			getTotal: function() {
				let itemCount = this.getItemCount(),
					total = 0;
				while (itemCount--) {
					total += basket[itemCount].price;

				}
				return total;
			}
		}

	})();
	//交互
	basketModule.addItem({
		item: "bread",
		price: 0.5
	});
	basketModule.addItem({
		item: "酱油",
		price: 1.5
	});
	//输出结果
	console.log(basketModule.getItemCount());//2
	console.log(basketModule.getTotal());//0.5+1.5 = 2
	//注意
	console.log(basketModule.basket);//underfined。因为basket没有暴露在公有的API中
</script>