javascript design patterns pdf

1. What is an interfaceThe parents who have studied design patterns may have heard of a principle of programming: "Programming for interfaces rather than implementing programming". So what exactly is an interface?An interface defines the means by which an object should have those methods, but does not specify the specific implementation of these methods. Learning C #, or vb.net, may be clear. The so-called

-specifiedAuthor. prototype. constructor = author; // set the constructor attribute to author. author. prototype. getbooks = function () {// Add a method to author. return this. books ;}; Classic inheritance is implemented through the above steps. If you need to use the author class, it is quite simple. var author = [];author[0] = new Author('Dustin Diaz', ['JavaScript Design

facilitate private use of variable spaces in their locations, without having to venture into the specific implementation. Bridging functions in this special case are also called privileged functions. The following is a simple example: VaR human = function () {// The number of human feet defined here. This is an inherent feature of humans and cannot be changed var footnum = 2; // using this method, you can get the number of human feet this. getfootnum = function () {return footnum ;};}; var zhao

Detailed description of the design principle of the client message framework in JavaScript This article describes the design principle of the client message framework in JavaScript, including the communication between the client and the server. For more information, see Wow -- it's a dangerous question, right? Our unde

Introducing the Appearance mode (facade) provides a consistent interface to a set of interfaces in a subsystem that defines a high-level interface that is worth the ease of use of this subsystem. The body appearance pattern simplifies not only the interfaces in the class, but also the interface and the caller. The appearance pattern is often considered a prerequisite for developers, it can encapsulate some complex operations and create a simple interface for invocation. Appearance

In-depth understanding of the JavaScript series (25): detailed explanation of the singleton mode of the Design Mode This article mainly introduces a deep understanding of the JavaScript series (25): a detailed explanation of the singleton mode of the design mode. This article provides implementation methods of multiple

, the chef of the canteen will not be because you ordered a roast duck and a cabbage to fry the two dishes in a pot. He is more than willing to offer you a roast duck meal package. Also in the program design, we need to ensure that the function or object as far as possible in a reasonable granularity, after all, not everyone likes to eat roast duck and just like to eat cabbage.Another benefit of the skin pattern is that you can hide real implementatio

. Of course, branching is not always a more efficient option, with only one branch in two or more branches being used, and other branches taking up memory.When considering whether to use branch technology, it is necessary to weigh the pros and cons of shortening the time and taking up more memory.The following XHR are implemented using branch technology:varXHR = ( function(){ varStandard = {createxhrobj: function(){ return NewXMLHttpRequest (); } };varActivexnew = {createxhrobj:

cannot prototype each one to match its interface. The object adapter can adapt its parent object interface method or property. There are some patterns with the adapter modeStructures are very similar, such as decorator mode , proxy mode , and appearance mode . These patterns are all part of the "packageThe other object is wrapped by one object. The key to distinguishing them is still the intent of the

} One}This object has 3 members: the order list, the method to add the order, and the method to create the order.The client is used as follows:1 var New Flightorder (); 2 flight.create (); 3 4 var New totalorders (); 5 Orders.addorder (new Flightorder ()); 6 Orders.addorder (new Hotelorder ()); 7 orders.create ();The client invocation shows two ways, one is to create a single ticket order, one to create multiple orders, but ultimately to create the creation method, which is a typical appl

Today, I got the book "JavaScript design Mode" written by Zhang Jongming, and began a deeper study of JavaScript.See the beginning of the book, although before reading, some good video of the explanation, to JavaScript has a basic understanding, but, in the content of the book, I still have a feeling of their own poor 108,000, the previous code is not written, us

This article mainly introduces the design principle of the client message framework in JavaScript, including the communication between the client and the server. If you need it, you can refer to wow. It is a dangerous question, right? Our understanding of what is essential will certainly change with our understanding of the problem to be solved. So I won't lie-what I understood a year ago was unfortunately

]; if (Interface.constructor!== interface) { throw new Error ("Function Interface.ensureimplements expects arguments" + "Two and above to be instances of Interface."); } for (var j = 0, Methodslen = interface.methods.length J var method = Interface.methods[j]; if (!object[method] | | | typeof object[method]!== ' function ') { throw new Error ("Function Interface.ensureImplements:object" + "does not implement" "+ Interface.name +" interface. Method "+ Method +" is not found. "); } } }

) { if (instance===undefined) { instance=new Singleton (options); } return instance; } ; return _static; }) (); var singletontest=singletontester.getinstance ({ pointx:5 }); Record the output of the POINTX for verification //output: 5 console.log (SINGLETONTEST.POINTX); Summary Singleton is useful, and often when it is found in JavaScript, it means we may need to reassess ou

In C #, the Singleton is to ensure that a class has only one instance, the implementation of the method is generally first to determine whether the existence of the instance, if there is a direct return, if it does not exist to create a return, will provide a static method, through the static method can obtain a unique instance. This ensures that there is only one instance object for a class: public class singleton{ private static Singleton _instance = null ; private Singleton () {} pu

javascript| Design Simple design Patterns for classesDefine a class Class1function Class1 () {Constructors} To implement the member definition of a class by specifying a prototype objectClass1.prototype = {Someproperty: "Simple",somemethod:function {Method code},In fact, properties and methodsThe members of a class are

events in JavaScript. This is the pattern we've come across again and again, but the more popular client-side library behavior is fundamentally a mixed broker, providing us with APIs like they are observer patterns. When I first wrote Postal.js, I began to walk into the stage of "intermediary for all things." In the prototypes and constructors I've written, it's not uncommon for distribution and subscripti

In JavaScript, a single example pattern is one of the most basic and often used design patterns, and may inadvertently be used in a single case pattern.This article will start with the most basic theory, the basic concept and implementation of the single case model, and finally use an example to describe the application of the single case pattern. Theoretical ba

combinations, while purely using an adapter is not possible. The proxy mode defines a proxy for another object without changing its interface. Reference: https://github.com/tcorral/design-patterns-in-javascript/blob/master/adapter/index.htmlsynchronization and recommendation this article has been synchronized to the directory index: in-depth understanding of