JavaScript Object-oriented Programming (ii) Encapsulation of classes

Definition of Class

Way One

varBook =function(ID, name, price) {//private property, external cannot be accessed directly    varnum = 1; //Private Methods,    functionCheckid () {};  This. GetName =function(){};  This. GetPrice =function(){};  This. SetName =function(){};  This. Setprice =function(){};  This. ID =ID;  This. Copy =function(){};  This. SetName (name);  This. Setprice (price);} Book.ischinese=true; Book.resettime=function() {Console.log (' New Time ');} Book.prototype={isjsbook:false, display:function(){}            }varb =NewBook (one, ' JavaScript design mode ', 50); Console.log (B.num); Console.log (B.isjsbook); Console.log (b.id); Console.log (B.ischinese) ;

Way Two

varBook = (function(){        varBooknum = 0; functionCheckbook (name) {}//returns the constructor function    return function(newid,newname,newprice) {//Private Variables        varName,price; //Private Methods        functionCheckid (ID) {}//Privileged Methods         This. GetName =function(){};  This. GetPrice =function(){};  This. SetName =function(){};  This. Setprice =function(){}; //Common Attributes         This. ID =newId; //Public Methods         This. Copy =function(){}; Booknum++; if(booknum>100){            Throw NewError (' We only publish 100 books '); }         This. SetName (name);  This. Setprice (price); }})(); Book.prototype= {    //static public PropertiesIsjsbook:false, display:function(){}}

Mode three

varBook = (function() {    //static private variable 0    varBooknum = 0; //Static Private Methods    functionCheckbook (name) {}//Create Class    function_book (newid,newname,newprice) {//Private Variables        varName,price; Name=NewName; Price=Newprice; //Private Methods        functionCheckid (ID) {}//Privileged methods (objects created can be accessed)         This. GetName =function(){returnname;};  This. GetPrice =function(){returnPrice ;};  This. SetName =function(Mingcheng) {name =Mingcheng;};  This. Setprice =function(){}; //Public properties (objects can be accessed)         This. ID =newId; //Public methods (objects can be accessed)         This. Copy =function(){}; Booknum++; if(booknum>100){            Throw NewError (' We only publish 100 books '); }        //Constructors         This. SetName (name);  This. Setprice (price); }    //Constructing prototypes_book.prototype = {        //static public PropertiesIsjsbook:false,        //static public methodsDisplayfunction(){return' Hello World '}        }; return_book;}) ();varBook =NewBook (' JavaScript ', 100); Console.log (book); Console.log (Book.isjsbook); Console.log (Book.getname ()); Console.log (book.id); Console.log (Book.getprice ()); Book.setname (' Test01 '); Console.log (Book.getname ()); Console.log (Book.display ()) ;

Test environment node. JS version 8.10.0

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Reference list

1. The author of JavaScript design mode Zhang Rongming

JavaScript Object-oriented Programming (ii) Encapsulation of classes