javascript design patterns pdf

developers, never care about these behaviors. The code is as follows:JavaScript var address = (function// address module function(obj) { Address.refresh (obj); }); return { function(avatar) { console.log (' Refresh receipt address List ');} } ;}) ();Advantages and Disadvantages Supports simple broadcast communication and automatically notifies all subscribed objects; After page loading publishers can easily have a dynamic association wi

to the previously saved policy object: var bonus = new bonus (); Bonus.setsalary (10000); Bonus.setstrategy (new performances ()); Set Policy Object Console.log (Bonus.getbonus ());//output: 40000 bonus.setstrategy (New Performancea ());//Set Policy Object Console.log (Bonus.getbonus ()); Output: 30000 We've just reconstructed this year's year-end bonus code with a policy model, and we can see that the code becomes clearer after the policy pattern is refactored, and that the

initialize, with the syntax of the Object.defineproperties or Object.defineproperty method type. It allows you to set properties such as enumerable, writable, or configurable.If you want to implement prototype mode yourself, instead of using object.create directly. You can use code like the following to achieve the above example:varVehicleprototype = {init:function(Carmodel) { This. model = Carmodel; }, Getmodel:function() {console.log (' vehicle mould is: ' + This. model); }};functionVehicle (

use an iterator to iterate over the upload object until it gets to a usable one: //IE Upload Control varGetactiveuploadobj =function(){ Try{ return NewActiveXObject ("txftnactivex.ftnupload" ); }Catch(e) {return false; } }; //the Supportflash function does not provide varGetflashuploadobj =function(){ if(supportflash ()) {varstr = ' ; return$ (str). appendTo ($ (' body ')) ); } return false; }; //form Upload varGetformupladobj =function(){

One of the several javaScript design patterns-the single mode and the javascript Design Pattern JavaScript is a weak type, dynamic, prototype-based language. This language feature makes it very easy, It is even common to implemen

method mode, abstract Factory mode, singleton mode, builder mode, prototype mode.② structure mode, a total of 7 kinds: adapter mode, adorner mode, proxy mode, appearance mode, bridge mode, combined mode, enjoy the meta-mode.③ Behavioral Model, a total of 11 kinds: policy mode, template method mode, observer mode, iterative sub-mode, responsibility chain mode, Command mode, Memo mode, state mode, visitor mode, mediator mode, interpreter mode.Reprint please indicate the source of the articleDesig

, and the leaf node object gives real feedback on the message.In strategy mode 3, the context does not have the ability to execute the algorithm, but instead delegates this responsibility to a policy object. Each policy object is responsible for the algorithm that has been encapsulated inside the object. When we issue a "computed" message to these policy objects, they return their respective computed results.1. See chapter 9th, "Command mode", 2. See chapter 10th, "Combination mode" 3. See chapt

, and the leaf node object gives real feedback on the message.In strategy mode 3, the context does not have the ability to execute the algorithm, but instead delegates this responsibility to a policy object. Each policy object is responsible for the algorithm that has been encapsulated inside the object. When we issue a "computed" message to these policy objects, they return their respective computed results.1. See chapter 9th, "Command mode" 2. See chapter 10th, "Combinatorial Mode" 3. See chap

system, and that this pattern can help them complete the reorganization for parts of the system that are not suitable for a particular purpose.Patterns that fall into this category include: Decorator (decorator) Facade (appearance) Flyweight (enjoy Yuan) Adapter (Adapter) Proxy (agent) Iii. Patterns of behaviorBehavioral patterns focus on improving or simplifying communication between d

JavaScript design patterns and development practices-JavaScript Polymorphism "Polymorphism" is derived from polymorphism in the Greek text. The split is poly (plural) + morph (morphology) + ism, which can be literally understood as the plural form. The actual meaning of polymorphism is: the same operation acts on diffe