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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 16-9 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 16-9 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>/** * Stylesheet.js: utility methods for scripting CSS stylesheets. * * This module defines a Stylesheet class that is a simple wrapper * around an element of the document.styleSheets[] array. It defines useful * cross-platform methods for querying and modifying the stylesheet. **/// Construct a new Stylesheet object that wraps the specified CSSStylesheet.// If ss is a number, look up the stylesheet in the styleSheet[] array.function Stylesheet(ss) { if (typeof ss == "number") ss = document.styleSheets[ss]; this.ss = ss;}// Return the rules array for this stylesheet.Stylesheet.prototype.getRules = function() { // Use the W3C property if defined; otherwise use the IE property return this.ss.cssRules?this.ss.cssRules:this.ss.rules;}// Return a rule of the stylesheet. If s is a number, we return the rule// at that index. Otherwise, we assume s is a selector and look for a rule// that matches that selector.Stylesheet.prototype.getRule = function(s) { var rules = this.getRules(); if (!rules) return null; if (typeof s == "number") return rules[s]; // Assume s is a selector // Loop backward through the rules so that if there is more than one // rule that matches s, we find the one with the highest precedence. s = s.toLowerCase(); for(var i = rules.length-1; i >= 0; i--) { if (rules[i].selectorText.toLowerCase() == s) return rules[i]; } return null;};// Return the CSS2Properties object for the specified rule.// Rules can be specified by number or by selectorStylesheet.prototype.getStyles = function(s) { var rule = this.getRule(s); if (rule && rule.style) return rule.style; else return null;};// Return the style text for the specified rule.Stylesheet.prototype.getStyleText = function(s) { var rule = this.getRule(s); if (rule && rule.style && rule.style.cssText) return rule.style.cssText; else return "";};// Insert a rule into the stylesheet.// The rule consists of the specified selector and style strings.// It is inserted at index n. If n is omitted, it is appended to the end.Stylesheet.prototype.insertRule = function(selector, styles, n) { if (n == undefined) { var rules = this.getRules(); n = rules.length; } if (this.ss.insertRule) // Try the W3C API first this.ss.insertRule(selector + "{" + styles + "}", n); else if (this.ss.addRule) // Otherwise use the IE API this.ss.addRule(selector, styles, n);};// Remove the rule from the specified position in the stylesheet.// If s is a number, delete the rule at that position.// If s is a string, delete the rule with that selector.// If n is not specified, delete the last rule in the stylesheet.Stylesheet.prototype.deleteRule = function(s) { // If s is undefined, make it the index of the last rule if (s == undefined) { var rules = this.getRules(); s = rules.length-1; } // If s is not a number, look for a matching rule and get its index if (typeof s != "number") { s = s.toLowerCase(); // convert to lowercase var rules = this.getRules(); for(var i = rules.length-1; i >= 0; i--) { if (rules[i].selectorText.toLowerCase() == s) { s = i; // Remember the index of the rule to delete break; // And stop searching } } // If we didn't' find a match, just give up if (i == -1) return; } // At this point s will be a number. // Try the W3C API first, then try the IE API if (this.ss.deleteRule) this.ss.deleteRule(s); else if (this.ss.removeRule) this.ss.removeRule(s);};</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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