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A monomer is an object that is used to partition namespaces and organize related properties and methods, and if she can be instantiated, she can only be instantiated once (she can only marry once and not married). Monomer mode is one of the most basic but also most useful patterns in JavaScript. Characteristics: 1. Can be used to partition the namespace, thereby clearing the risk or impact of global vari
The Singleton mode belongs to the creation mode among the three modes. In the design pattern book, the intention is described as follows: ensure that a class has only one instance and provide a global access point to it. In JavaScript design patterns, Singleton has a broader definition: Singleton is an object used to d
JavaScript Design ModePreface I recently read the book "JavaScript Design Patterns", which contains many knowledge points and cannot be digested for a moment. Remember it first.Ps: For more information, see Uncle Tom's blog to understand the
A design pattern for JavaScript Simple design Patterns for classes Define a class Class1 function Class1 () { Constructors } To implement the member definition of a class by specifying a prototype object Class1.prototype = { Someproperty: "Simple", somemethod:function { Method code }, In fact, properties and methods T
"){Continue;}// Ignore unselected itemsIf (! Hrefs [I]. parentNode. firstChild. checked ){Continue;}Id = hrefs [I]. href. split ('--') [1];Hrefs [I]. parentNode. id = "v" + id;Videos. getInfo (id );}}; Full: https://github.com/shichuan/javascript-patterns/blob/master/design-patterns/proxy.htmlSummary The proxy mode i
() { this. Discount= 0.5function(price) {return This . Discount;}Old Customers:function Oldprice () { this. Discount =0.3function(price) { returnthis. discount;}General customersfunction Price () { the. Discount =0.3function(price) { return price ;}2. The context:functionContext () { This. Name = ' '; This. Strategy =NULL; This. Price = 0;} Context.prototype.set=function(name, strategy, price) { This. Name =name; This. Strategy =strategy; This. Price =Price ;} Context.proto
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 referenced to each other, and must be done through the t
event design overview the event mechanism makes the Program logic more in line with the real world, in JavaScript, many objects have their own events. For example, the button has an onclick event, and the drop-down list box has an onchange event. These events can be easily programmed. Can an event mechanism be implemented for a defined class? Yes. Through the event mechanism, classes can be designed as
A deep understanding of the JavaScript series (27): a detailed explanation of the builder mode of the Design Mode This article mainly introduces a deep understanding of the JavaScript series (27): a detailed explanation of the builder mode of design patterns. The Builder mod
2016.08.30the JavaScript Design patterns and development practices, the people's post and telecommunications press , 5 months , version 1P13Find the parts of the change and encapsulate it to make it easy to replace, and the rest is the unchanging part.P49function currying (currying) is to collect parameters several times and then pass them as an array to the h
The singleton mode restricts the number of instances of a class to be instantiated only once. Singleton mode, where the instance does not exist, you can create a new instance of the class by creating a class with a method, and if the instance already exists, it simply returns the reference to the object. Singleton is different from a static class, it can be deferred instantiation.1. Object literal implementationThere are many ways to implement singleton patt
constructor, and by initializing the prototype in the constructor (only if necessary), while preserving the advantages of using both constructors and prototypes. In other words, you can determine whether a prototype needs to be initialized by checking that a method that should exist is valid.Parasitic constructor modeIf the above methods are not applicable, parasitic patterns can be applied. The core idea of this pattern is to create a function that
it changes. The following is a simple example... // Example using listenersvar element = $ ('example '); var fn1 = function (e) {// handle click}; var FN2 = function (E) {// do other stuff with click}; addevent (element, 'click', fn1); addevent (element, 'click', FN2 ); // example using handlersvar element = document. getelementbyid ('B'); var fn1 = function (e) {// handle click}; var FN2 = function (e) {// do other stuff with click}; element. onclick = fn1; element. onclick = FN2; // fn1 is ov
NotesBridging mode, more difficult to understand, mainly to understand the principles of some design patterns, as well as the idea of bridging mode, the principle is not rotten with inheritance because the inheritance is compiled and fixed he can not change the implementation of the father; object-oriented design uses combination/aggregation multiplexing instead
') { nbsp ; Return price * 0.5; } else if (PersonType = = ' old ') {//Customer 30 percent Return price * 0.3; } else { return price;//All other full price }}N BSP; We look at the above as a class, if we want to extend a price method, we have to add a new else if, or modify an algorithm logic, to have an if or else if the modification, this is a single class modification, and this situation will often change this class, This violates one of the principles of
1. Singleton mode: guarantees that a class has only one instance and provides a global access point to access it.2. Strategy mode: Define a series of algorithms, encapsulate them one by one, and make them interchangeable.3. Proxy mode: Provides a substitute or placeholder for an object in order to control access to it.4. Iterative mode: Provides a way to sequentially access individual elements in an aggregated object without exposing the object's internal representation.5. Publish-Subscribe mode
Factory mode is one of the most commonly used instantiation object patterns, and is a pattern that replaces the new operation with a factory method. In Factory mode, we create the object without exposing the creation logic to the client, and by using a common interface to point to the newly created object. Because the factory pattern is equivalent to creating the instance object's new, in JavaScript usually
require some sort of optimization. This pattern is especially useful for JavaScript programmers because it can be used to reduce the number of DOM elements that are used on a Web page, knowing that these elements require a lot of memory. With the use of this pattern and the combination of patterns and other organizations can develop a rich and complex web application systems, they can run smoothly in any
/** Factory mode * requires a specific environment to create different instances * Handle a large number of small objects with the same attributes * * such as cars, different types of cars * Source From:javascript Patterns Page 148 **/functioncarmaker () {};//General MethodsCarMaker.prototype.drive =function () { return"Vroom, I have" + This. Doors + "doors.";};//defining static Factory methodsCarmaker.factory =function(type) {varConstr = Type,//Pe
As for the description of the filter condition, pattern matching is a very common and useful way. In JavaScript, it's quite handy to use JSON to describe patterns, so let's do a JSON pattern matching tool. Use case design As a dispatcher, we only need two methods: Notify and capture. One of the simplest use cases is this: Copy Code code as follows:
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