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<html><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Keywords" name="Keywords"content="JavaScript, examples, JavaScript: The Definitive Guide"><title>Example 10-3 from JavaScript: The Definitive Guide, Fifth Edition</title><style>body { font-family: arial, sans-serif}.lefttitle { font: bold x-small arial, sans-serif; margin: 5px; letter-spacing: .15em; text-transform:uppercase;}.leftcaption { font: italic x-small sans-serif; margin-bottom: 20px;}#banner { font-family:sans-serif; color:#333; font-size:x-large; font-weight:normal; padding:15px; padding-top: 3px; border-bottom:4px double #666;}#banner h1 { font-size: x-large; margin: 0px; padding: 0px;}#banner .description { font-size:large; margin-left: 2px;}pre { border: solid black 1px; background-color: #ddd; padding: 10px; margin: 0px;} </style></script></head><body><div id="banner"><h1>davidflanagan.com/javascript5</h1><span class="description">Example 10-3 from<i>JavaScript: The Definitive Guide, Fifth Edition</i></span></div><div style="float: left; 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text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><pre>/** * com/davidflanagan/Shapes.js: a module of classes representing shapes * * This module defines classes within the com.davidflanagan.shapes namespace * This module requires the com/davidflanagan/Class.js module **/// First, check for the Class modulevar com; // Declare global symbol before testing for its presenceif (!com || !com.davidflanagan || !com.davidflanagan.Class) throw new Error("com/davidflanagan/Class.js has not been loaded");// Import a symbol from that modulevar define = com.davidflanagan.Class.define;// We know from the test for the Class module that the com.davidflanagan// namespace exists, so we don't have to create it here. // We just create our shapes namespace within it.if (com.davidflanagan.shapes) throw new Error("com.davidflanagan.shapes namespace already exists");// Create the namespacecom.davidflanagan.shapes = {};// Now define classes storing their constructor functions in our namespacecom.davidflanagan.shapes.Circle = define({ /* class data here */ });com.davidflanagan.shapes.Rectangle = define({ /* class data here */ });com.davidflanagan.shapes.Triangle = define({ /* class data here */});</pre><div class="lefttitle" style="padding:0px; text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><p><script type="text/javascript">amazon_ad_tag="davidflanagancom"; amazon_ad_width="300"; amazon_ad_height="250"; amazon_ad_logo="hide";</script><script type="text/javascript" src="../../www.assoc-amazon.com/s/ads.js" tppabs="http://www.assoc-amazon.com/s/ads.js"></script></div></body></html>?? 快捷鍵說明
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