learning javascript design patterns

Introduced Starting with this chapter, we'll step through the implementation of the various design patterns used in JavaScript, where I'm not going to introduce the theory of the schema itself too much, but only focus on implementation. OK, officially started. In the eyes of traditional development engineers, a single example is to ensure that a class has only

will execute.varApp =NewHandler ({handle:function() {Console.log (' app handle '); }}, 3);varDialog =NewHandler (app, 1);d Ialog.handle =function() {console.log (' dialog before ... ')//here to do the specific processing operationHandler.prototype.handle.call ( This);//Go on, move on.Console.log (' dialog after ... ')};varbutton =NewHandler (Dialog, 2); button.handle =function() {console.log (' button before ... ')//here to do the specific processing operationHandler.prototype.handle.call ( Thi

Static ReadOnly ObjectLocker=New Object();Privatesingletonexample{}//the method of public access can overload multiple parameters; Public Staticsingletonexample getinstance () {if(mysingleton==NULL){Lock(Locker) {Mysingleton=Newsingletonexample ();}}returnMysingleton;}}View CodeAt this point, a, B runs to lock (locker) at the same time, only one thread can access it, so B. executes first, b obtains the lock, and after B executes, unlocks. A go, because there is no judgment whether mysingleton==

The first chapter of the study notes of "The design mode of learning in English" original requirements and designThe thing is to start, the company needs to do a set of procedures, ducks, designed as follows:A duck parent class, multiple derived classes, three override methods.First demand changeWe're going to fly, duck!!!!!.So we made the following changes:The parent class added the Fly method, well, all t

is as follows:Photo: Arsenal and Firearms, Bullet relations (PS: Just as, don't tangle yo)Abstract Factory method patterns can be used to design a system when the system is ready to provide a series of related objects to the user and does not want to create a coupling between user code and the class that creates the objects. The key to an abstract factory pattern is to define several abstract methods in an

ConceptThe responsibility chain pattern is to allow multiple objects to have the opportunity to process requests, thus avoiding the coupling between the sender and the recipient of the request. Link the object to a chain and pass the request along the chain until an object is processed by him.The object that receives the request in the chain either handles it personally or forwards it to the next candidate. The submitter does not specify how many objects will handle it, and either candidate can

=Newnypizzaingredientfactory ();6 7 if(Item.equals ("Cheese")) {8 9Pizza =NewCheesepizza (ingredientfactory);TenPizza.setname ("New York Style Cheese Pizza"); One A}Else if(Item.equals ("Veggie")) { - -Pizza =NewVeggiepizza (ingredientfactory); thePizza.setname ("New York Style Veggie Pizza"); - -}Else if(Item.equals ("Clam")) { - +Pizza =NewClampizza (ingredientfactory); -Pizza.setname ("New York Style Clam Pizza"); + A}Else if(Item.equals ("Pepperoni")) { at -Pizza =New

2. Continuation of local variable life var function (SRC) { varnew Image (); = src;}Using closures to extend the use of IMGvar report = (function() { var imgs = []; // IMG left it in memory. return function (SRC) { varnew Image (); Imgs.push (IMG); = src; }}) (); 4. Closures and object-oriented Closures:var function () { var value =0; return {call :function() { value+ +; Console.log (val

code is as follows: The code for Mutequack is as follows: So now you just need to test to see the final result: end note:In fact, most of the content belongs to the transport, the original very few, but also deleted the original book part of the content, will slowly more practical understanding to explain a pattern, the first test of water, code is not all the small partners to write their own, do not Baidu, code this thing, although the wheel has been created, but their own side, Will understa

voidNotifyobserver () {//TODO auto-generated Method Stub for(Observer o:list) {o.update ("Hello, world!."); } }}The following code is specific to the observer implementation: Package Obeserver; Public class Implements Observer { @Override publicvoid update (String str) { // TODO auto-generated method stub System.out.println (str);} }Write a test code below to see: PackageObeserver; Public classObservertest { Public Static voidMain (string[] args) {Subject S1

Single-instance learning for php design patterns Class { Private function _ construct (){} } $ A = new (); ?> Program running result: Fatal error: Call to private A :__ construct () from invalid context in E: \ PHPProjects \ test. php on line 6We have disabled the external use of new to instantiate this cl

is stored so that the waiter does not need to know, decouple with the waiterIterator interface:1 Public Interface Iterator { 2 boolean hasnext (); 3 Object Next (); 4 } Dinner Menu iterator implementation, for its underlying array storage method:1 Public classDinermenuiteratorImplementsIterator {2 menuitem[] items; 3 intPosition = 0; 4 5 Publicdinermenuiterator (menuitem[] items) {6 This. Items =items; 7 } 8 9 PublicObject Next () {TenMenuItem

the object flow to write the memo to the file. The class diagram for the memo pattern structure is as follows:Diagram one: Class diagram of the memo pattern1.3Memoadvantages of the model(1) Memo mode The use of memos can save the original person's internal state, so that only very "intimate" objects can access the data in the memo. (2) The memorandum mode emphasizes the principle of single responsibility of class design, and separates the characteriz

Simple factory model for learning design patterns with jbpm Mode Overview The simple factory mode is the class creation mode. It is responsible for instantiating a large number of product classes with common interfaces or basic classes. The simple factory mode dynamically determines the class to be instantiated based on the input parameters during the factory cl

In web development, because differences between browsers are implemented differently, some sniffing work is unavoidable, such as the fact that we need to be able to use the universal event binding function in each browser addevent//General Wording//Cons: Every time he is called, it executes the IF condition,varAddevent =function(Elem, type, handler) {if(window.addeventlister) {returnElem.addeventlistener (type, Handler,false); } if(window.attachevent) {returnElem.attachevent (' on ' +type, ha

[teamcolor]| | [];//all members of the team for(vari=teamplayers.length-1;i>=0;i--){ if(teamplayers[i]===player{Teamplayers.splice (i,1); } } }; //Players Change Teamoperations.changeteam=function(Player,newteamcolor) {operations.removeplayer (player); Player.teamcolor=Newteamcolor; Operations.addplayer (player); } //player DeathOperations.playerdead=function(player) {varTeamcolor=Player.teamcolor, Teamplayers=Players[teamcolor]; varAll_dead=true; f

); }, instructions: "Incoming values can only protect letters and numbers, and cannot contain special characters"};When used, we first define the set of data that needs to be validated, and then we need to define the types of rules that each data needs to validate, with the following code:var data = { first_name: "Tom", last_name: "Xu", Age : "Unknown", Username: "Tomxu"}; Validator.config = { first_name: ' Isnonempty ', age : ' Isnumber ', username: ' Isalphanum '};Finally,

'); - }); to return This; + }, -Addevent:function(Type, fn) { the varAdd =function(EL) { * if(widow.addeventlistener) { $El.addeventlistener (Type, FN,false)Panax Notoginseng } - Else if(widow.attachevent) { theEl.attachevent (' on ' +type, fn); + } A }; the + This. each (function(EL

=function () { the // ... - } - This. SetName =function () { - // ... + } - This. Setprice =function () { + // ... A } at //Object Public Properties - This. ID =ID - //Object Public Method - This. Copy =function () { - // ... - } in -}In OOP, there are two concepts: static properties and Static methods, both of which belong to the class, and not each object, the invocation can only be used by the class name plus point syntax, then how to implement JS?In

The plane puts the registration information in the tower, sends the data to the tower, and reports some information about the other aircraft.varFeiji =function(name) { This. Name =name;} Feiji.prototype.send=function(msg,to) {Console.log ( This. name+ "Send Message"); Tatai.sned (msg,to);}; Feiji.prototype.jieshou=function(msg) {Console.log ( This. name+ "[Received]" +msg);}varTatai ={all:{}, Zhuce:function(f) { This. all[f.name]=F; }, Sned:function(msg,to) { This. All[to.name].jieshou (msg); }}