JS面向对象编程--封装

ES5

var Book=(function () {
        //私有变量
        var bookNum=0;
        //私有方法
        function checkBook(name){}
        //创建类
        function _Book(newId,newName,newPrice){
            //实例方法
            this.getName=function () { return newName};
            this.getPrice=function () { return newPrice};
        }
        //构建原型
        _Book.prototype={
            //实例公有属性
            isJSBook:false,
            //实例共有方法
            dispaly:function () {}
        }
        //类静态属性
        _Book.author="hyylsw";
        return _Book;
    })();
     var book=new Book(1,"js",12.4);
    console.log(book.getName());
    console.log(book.getPrice());
    console.log(book.isJSBook);

ES6

 class Book2{
       constructor(newId,newName,newPrice){
           this.id=newId;
           this.name=newName;
           this.price=newPrice;
       }
       display(){}
   }
   let book2=new Book2(1,"java",12.3);
   console.log(book2.name);