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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 21-5 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 21-5 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>/** * Return a Document object that holds the contents of the <xml> tag * with the specified id. If the <xml> tag has a src attribute, an XML * document is loaded from that URL and returned instead. * * Since data islands are often looked up more than once, this function caches * the documents it returns. */XML.getDataIsland = function(id) { var doc; // Check the cache first doc = XML.getDataIsland.cache[id]; if (doc) return doc; // Look up the specified element doc = document.getElementById(id); // If there is a "src" attribute, fetch the Document from that URL var url = doc.getAttribute('src'); if (url) { doc = XML.load(url); } // Otherwise, if there was no src attribute, the content of the <xml> // tag is the document we want to return. In Internet Explorer, doc is // already the document object we want. In other browsers, doc refers to // an HTML element, and we've got to copy the content of that element // into a new document object else if (!doc.documentElement) {// If this is not already a document... // First, find the document element within the <xml> tag. This is // the first child of the <xml> tag that is an element, rather // than text, comment or processing instruction var docelt = doc.firstChild; while(docelt != null) { if (docelt.nodeType == 1 /*Node.ELEMENT_NODE*/) break; docelt = docelt.nextSibling; } // Create an empty document doc = XML.newDocument(); // If the <xml> node had some content, import it into the new document if (docelt) doc.appendChild(doc.importNode(docelt, true)); } // Now cache and return the document. XML.getDataIsland.cache[id] = doc; return doc;};XML.getDataIsland.cache = {}; // Initialize the cache</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>⌨️ 快捷键说明
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