Pro JavaScript Design Patterns 2008 phần 4 pptx

... possible. It is one of the most useful patterns in JavaScript and has its place in almost every project, no matter how large or small. In quick and simple projects, a singleton can be used simply ... pat- tern one of the most popular and widely used in JavaScript. CHAPTER 5 ■ THE SINGLETON PATTERN 74 908Xch05.qxd 11/15/07 10:36 AM Page 74 function constructor() { // All of the normal...

Ngày tải lên: 12/08/2014, 23:20

... 144 , 149 addEvent function, 142 , 146 – 147 benefits of, 148 vs. bridges, 111 common examples of, 141 – 142 as convenient methods, 143 – 144 creating event utility (example), 146 – 147 drawbacks of, 148 introduction ... 49 edit-in-place field using, 55–58 use of, 62 prototype attribute, 46 48 prototype chaining, 42 43 , 46 48 prototype method, 137 prototype objects, 45 49 , 57...

Ngày tải lên: 12/08/2014, 23:20

... Page xiii f7670b088a34e6aa65a5685727db1ff4 Pro JavaScript ™ Design Patterns Copyright © 2008 by Ross Harmes and Dustin Diaz All rights reserved. No part of this work may be reproduced or transmitted ... complex topic, and we devote Chapter 4 to it. Design Patterns in JavaScript In 1995, Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides published a book titled Des...

Ngày tải lên: 12/08/2014, 23:20

... tools in the object-oriented JavaScript programmer’s toolbox. The first principle of reusable object-oriented design mentioned in the Gang of Four’s Design Patterns says “Program to an interface, ... useful. In a large project, with many different programmers writing code, interfaces are essential. Often programmers are asked to use an API that hasn’t been written yet, or are asked to...

Ngày tải lên: 12/08/2014, 23:20

... original JavaScript cre- ators. The prototype attribute is meant to point to the prototype object, and through prototype CHAPTER 4 ■ INHERITANCE48 908Xch04a.qxd 11/15/07 10: 34 AM Page 48 Using ... Person. The first four lines of the function are the CHAPTER 4 ■ INHERITANCE 44 908Xch04a.qxd 11/15/07 10: 34 AM Page 44 Classical Inheritance JavaScript can be made to look like a c...

Ngày tải lên: 12/08/2014, 23:20

... bicycle; }; /* GeneralProductsBicycleShop class. */ var GeneralProductsBicycleShop = function() {}; extend(GeneralProductsBicycleShop, BicycleShop); GeneralProductsBicycleShop.prototype.createBicycle ... 11/15/07 10 :41 AM Page 118 The Bridge Pattern In the world of API implementations, bridges are incredibly useful. In fact, they’re probably one of the most underused patterns. Of all patt...

Ngày tải lên: 12/08/2014, 23:20

... { for ( var prop in styles ) { if (!styles.hasOwnProperty(prop)) continue; setStyle(el, prop, styles[prop]); } } CHAPTER 10 ■ THE FACADE PATTERN 145 908Xch10.qxd 11/15/07 10:57 AM Page 145 var topGallery ... a collection of poorly designed APIs by wrapping them in a single well-designed API. JavaScript Libraries As Facades JavaScript libraries are built for humans. They’re designed to s...

Ngày tải lên: 12/08/2014, 23:20

... browsers implement the console object: /* SimpleProfiler class. */ var SimpleProfiler = function(component) { this.component = component; }; SimpleProfiler.prototype = { buildList: function() { var ... returned result. CHAPTER 12 ■ THE DECORATOR PATTERN1 64 908Xch12.qxd 11/15/07 11:02 AM Page 1 64 decorators with dynamic interfaces (such as MethodProfiler) can be frightening at best. You m...

Ngày tải lên: 12/08/2014, 23:20

... Protection Proxy The virtual proxy is probably the most useful type of proxy to JavaScript programmers. Let’s briefly go over the other types and explain why they aren’t as applicable to JavaScript. A ... trafficked CHAPTER 14 ■ THE PROXY PATTERN206 908Xch 14. qxd 11/15/07 11:05 AM Page 206 The Proxy Pattern vs. the Decorator Pattern A proxy is similar to a decorator in many ways. Both d...

Ngày tải lên: 12/08/2014, 23:20

... much easier to access an otherwise difficult resource. CHAPTER 14 ■ THE PROXY PATTERN2 14 908Xch 14. qxd 11/15/07 11:05 AM Page 2 14 The Observer Pattern In an event-driven environment, such as the ... instantiate. Benefits of the Proxy Pattern Each type of proxy has a different set of benefits. The remote proxy allows you to treat a remote resource as a local JavaScript object. This i...

Ngày tải lên: 12/08/2014, 23:20