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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 16-7 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 16-7 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>/** * CSSClass.js: utilities for manipulating the CSS class of an HTML element. * * This module defines a single global symbol named CSSClass. This object * contains utility functions for working with the class attribute (className * property) of HTML elements. All functions take two arguments: the element * e being tested or manipulated and the CSS class c that is to be tested, * added, or removed. If element e is a string, it is taken as an element * id and passed to document.getElementById(). */var CSSClass = {}; // Create our namespace object// Return true if element e is a member of the class c; false otherwiseCSSClass.is = function(e, c) { if (typeof e == "string") e = document.getElementById(e); // element id // Before doing a regexp search, optimize for a couple of common cases. var classes = e.className; if (!classes) return false; // Not a member of any classes if (classes == c) return true; // Member of just this one class // Otherwise, use a regular expression to search for c as a word by itself // \b in a regular expression requires a match at a word boundary. return e.className.search("\\b" + c + "\\b") != -1;};// Add class c to the className of element e if it is not already there.CSSClass.add = function(e, c) { if (typeof e == "string") e = document.getElementById(e); // element id if (CSSClass.is(e, c)) return; // If already a member, do nothing if (e.className) c = " " + c; // Whitespace separator, if needed e.className += c; // Append the new class to the end};// Remove all occurrences (if any) of class c from the className of element eCSSClass.remove = function(e, c) { if (typeof e == "string") e = document.getElementById(e); // element id // Search the className for all occurrences of c and replace with "". // \s* matches any number of whitespace characters. // "g" makes the regular expression match any number of occurrences e.className = e.className.replace(new RegExp("\\b"+ c+"\\b\\s*", "g"), "");};</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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