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<!doctype html>
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<title>JavaScript的模式和反模式集合</title>
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<h1>JavaScript的模式集合</h1>
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<p>A JavaScript pattern and antipattern code collection that covers function patterns, jQuery patterns, design patterns, general patterns, literals and constructor patterns, object creation patterns (<em>upcoming</em>), code reuse patterns (<em>upcoming</em>), DOM and browser patterns (<em>upcoming</em>).</p>
<p>Weekly roundups (pattern updates) will be regularly <a href="http://twitter.com/shichuan">tweeted</a>.</p>
</section>
<section>
<h2>Function Patterns</h2>
<h3>API Patterns</h3>
<ul>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/function-patterns/callback.html" target="_blank">Callback patterns</a> - when you pass function A to function B as a parameter, function A is a callback function</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/function-patterns/configuration-objects.html" target="_blank">Configuration objects </a>- keep control of function arguments and makes it easily configurable</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/function-patterns/returning-functions.html" target="_blank">Returning functions </a>- one function returns another function or create another function on-demand</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/function-patterns/currying.html" target="_blank">Currying</a> - used to create new functions dynamically by partially applying a set of arguments</li>
</ul>
<h3>Initialization patterns</h3>
<ul>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/function-patterns/immediate-functions.html" target="_blank">Immediate functions</a> - syntax that enables function execution as soon as it is defined</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/function-patterns/immediate-object-initialization.html" target="_blank">Immediate object initialization</a> - this pattern is mainly suitable for one-off tasks</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/function-patterns/init-time-branching.html" target="_blank">Init-time branching</a> - branch code once during initlization initialization</li>
</ul>
<h3>Performance patterns</h3>
<ul>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/function-patterns/memoization.html">Memoization</a> - use function properties to avoid repeated computation</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/function-patterns/self-defining-functions.html">Self-defining functions</a> - self-overwrite with new bodies to do less work from the second invocation and after</li>
</ul>
</section>
<section>
<h2>jQuery Patterns</h2>
<ul>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/jquery-patterns/requery.html" target="_blank">requery</a> - avoid requery by using jQuery chaining</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/jquery-patterns/append.html" target="_blank">append</a> - use string concatenate and set innerHTML</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/jquery-patterns/data.html" target="_blank">data</a> - pattern and antipattern of using data</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/jquery-patterns/context-and-find.html" target="_blank">context and find</a> - use find over context</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/jquery-patterns/detach.html" target="_blank">detach</a> - take element off the DOM while manipulating them</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/jquery-patterns/event-delegation.html" target="_blank">event delegation</a> - event delegation pattern and antipattern</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/jquery-patterns/cache-selector.html" target="_blank">selector cache</a> - using selector cache to avoid requery</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/jquery-patterns/window-scroll-event.html" target="_blank">window scroll event</a> - avoid attaching handlers to the window scroll event</li>
</ul>
<h3>Selector</h3>
<ul>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/jquery-patterns/left-and-right.html" target="_blank">Left and Right</a> - specific on the right, light on the left</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/jquery-patterns/decending-from-id.html" target="_blank">Decending from id</a> - be more specific</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/jquery-patterns/universal-selector.html" target="_blank">Universal Selector</a> - use of universal selector</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/jquery-patterns/specific-when-needed.html" target="_blank">Be Specific when Needed</a> - be specific only when needed</li>
</ul>
</section>
<section>
<h2>Literals and Constructors Patterns</h2>
<ul>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/literals-and-constructors/object-literal.html" target="_blank">Object literal</a> - use the simpler and reliable object literal instead of new Object();</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/literals-and-constructors/enforcing-new.html" target="_blank">Enforcing new</a> - when you forget `new`, `this` inside the constructor will point to the global object</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/literals-and-constructors/array-literal.html" target="_blank">Array literal</a> - use array literal notation to avoid potential errors when creating dynamic arrays at runtime</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/literals-and-constructors/json.html" target="_blank">Working with JSON</a> - use library from JSON.org, YUI, jQuery instead of eval for parsing</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/literals-and-constructors/primitive-wrappers.html" target="_blank">Primitive wrappers</a> - try to use the primitive without wrapper</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/literals-and-constructors/regular-expression-literal.html" target="_blank">Regular expression literal</a> - try to use the shorter literal notation</li>
</ul>
</section>
<section>
<h2>Design Patterns</h2>
<h3>Creational</h3>
<ul>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/design-patterns/builder.html" target="_blank">Builder</a> - constructs complex objects by separating construction and representation</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/design-patterns/factory.html" target="_blank">Factory method</a> - creates objects without specifying the exact class to create</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/design-patterns/singleton.html" target="_blank">Singleton</a> - restricts object creation for a class to only one instance</li>
</ul>
<h3>Structural</h3>
<ul>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/design-patterns/decorator.html" target="_blank">Decorator</a> - dynamically adds/overrides behaviour in an existing method of an object</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/design-patterns/facade.html" target="_blank">Facade</a> - provides a simplified interface to a large body of code</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/design-patterns/proxy.html" target="_blank">Proxy</a> - provides a placeholder for another object to control access, reduce cost, and reduce complexity</li>
</ul>
<h3>Behavioral</h3>
<ul>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/design-patterns/chain-of-responsibility.html" target="_blank">Chain of responsibility</a> - delegates commands to a chain of processing objects</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/design-patterns/command.html" target="_blank">Command</a> - creates objects which encapsulate actions and parameters</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/design-patterns/iterator.html" target="_blank">Iterator</a> - implements a specialized language</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/design-patterns/mediator.html" target="_blank">Mediator</a> - allows loose coupling between classes by being the only class that has detailed knowledge of their methods</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/design-patterns/observer.html" target="_blank">Observer</a> - is a publish/subscribe pattern which allows a number of observer objects to see an event</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/design-patterns/strategy.html" target="_blank">Strategy</a> - allows one of a family of algorithms to be selected on-the-fly at runtime</li>
</ul>
</section>
<section>
<h2>General Patterns</h2>
<ul>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/general-patterns/minimizing-globals.html" target="_blank">Minimizing Globals</a> - create and access a global variable in a browser environment</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/general-patterns/globals.html" target="_blank">The Problem with Globals</a> - various problems with globals</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/general-patterns/access-to-global-object.html" target="_blank">Access to the Global Object</a> - access the global object without hard-coding the identifier window</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/general-patterns/single-var-pattern.html" target="_blank">Single var Pattern</a> - use one var statement and declare multiple variables</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/general-patterns/hoisting.html" target="_blank">Hoisting</a> - var statements anywhere in a function act as if the variables were declared at the top of the function</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/general-patterns/for-loops.html" target="_blank">for loops</a> - optimized for loops</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/general-patterns/for-in-loops.html" target="_blank">for-in loops</a> - optimized for-in loops</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/general-patterns/built-in-prototypes.html" target="_blank">(Not) Augmenting Built-in Prototypes</a> - only augment built-in prototypes when certain conditions are met</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/general-patterns/switch-pattern.html" target="_blank">switch Pattern</a> - improve the readability and robustness of your switch statements</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/general-patterns/avoiding-implied-typecasting.html" target="_blank">Implied Typecasting</a> - avoid implied typecasting</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/general-patterns/avoiding-eval.html" target="_blank">Avoiding eval()</a> - avoid using eval()</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/general-patterns/parseint.html" target="_blank">Number Conversions with parseInt()</a> - use the second radix parameter</li>
<li><a href="https://github.com/shichuan/javascript-patterns/blob/master/general-patterns/conditionals.html" target="_blank">Conditionals</a> - pattern and antipattern of using if else</li>
</ul>
</section>
<section>
<h2><em>References</em></h2>
<ol>
<li>
The Essentials of Writing High Quality JavaScript<br />
<a href="http://net.tutsplus.com/tutorials/javascript-ajax/the-essentials-of-writing-high-quality-javascript/" target="_blank">http://net.tutsplus.com/tutorials/javascript-ajax/the-essentials-of-writing-high-quality-javascript/</a>
</li>
<li>
JSPatterns<br />
<a href="http://www.jspatterns.com/" target="_blank">http://www.jspatterns.com/</a>
</li>
<li>
jQuery Anti-Patterns for Performance & Compression<br />
<a href="http://paulirish.com/2009/perf/" target="_blank">http://paulirish.com/2009/perf/</a>
</li>
<li>
How DRY Affects JavaScript Performance<br />
<a href="http://velocityconf.com/velocityeu/public/schedule/detail/21634" target="_blank">http://velocityconf.com/velocityeu/public/schedule/detail/21634</a>
</li>
<li>
Object Oriented JavaScript<br />
<a href="http://www.packtpub.com/object-oriented-javascript/book" target="_blank">http://www.packtpub.com/object-oriented-javascript/book</a>
</li>
<li>
JavaScript Patterns<br />
<a href="http://shop.oreilly.com/product/9780596806767.do" target="_blank">http://shop.oreilly.com/product/9780596806767.do</a>
</li>
<li>
JavaScript: The Good Parts<br />
<a href="http://shop.oreilly.com/product/9780596517748.do" target="_blank">http://shop.oreilly.com/product/9780596517748.do</a>
</li>
<li>
Pro JavaScript Design Patterns<br />
<a href="http://jsdesignpatterns.com/" target="_blank">http://jsdesignpatterns.com/</a>
</li>
<li>
Essential JavaScript Design Patterns For Beginners, Volume 1.<br />
<a href="http://www.addyosmani.com/resources/essentialjsdesignpatterns/book/" target="_blank">http://www.addyosmani.com/resources/essentialjsdesignpatterns/book/</a>
</li>
<li>
Eloquent JavaScript<br />
<a href="http://eloquentjavascript.net/" target="_blank">http://eloquentjavascript.net/</a>
</li>
</ol>
</section>
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