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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 17-2 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 17-2 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>/* * Handler.js -- Portable event handler registration functions * * This module defines event handler registration and deregistration functions * Handler.add() and Handler.remove(). Both functions take three arguments: * * element: the DOM element, document, or window on which the handler * is to be added or removed. * * eventType: a string that specifies the type of event for which the * handler is to be invoked. Use DOM-standard type names, which do * not include an "on" prefix. Examples: "click", "load", "mouseover". * * handler: The function to be invoked when an event of the specified type * occurs on the specified element. This function will be invoked as * a method of the element on which it is registered, and the "this" * keyword will refer to that element. The handler function will be * passed an event object as its sole argument. This event object will * either be a DOM-standard Event object or a simulated one. If a * simulated event object is passed, it will have the following DOM- * compliant properties: type, target, currentTarget, relatedTarget, * eventPhase, clientX, clientY, screenX, screenY, altKey, ctrlKey, * shiftKey, charCode, stopPropagation(), and preventDefault() * * Handler.add() and Handler.remove() have no return value. * * Handler.add() ignores duplicate registrations of the same handler for * the same event type and element. Handler.remove() does nothing if called * to remove a handler that has not been registered. * * Implementation notes: * * In browsers that support the DOM standard addEventListener() and * removeEventListener() event registration functions, Handler.add() and * Handler.remove() simply invoke these functions, passing false as the * third argument (meaning that the event handlers are never registered as * capturing event handlers). * * In versions of Internet Explorer that support attachEvent(), Handler.add() * and Handler.remove() use attachEvent() and detachEvent(). To * invoke the handler function with the correct this keyword, a closure is * used. Since closures of this sort cause memory leaks in Internet Explorer, * Handler.add() automatically registers an onunload handler to deregister * all event handlers when the page is unloaded. To keep track of * registered handlers, Handler.add() creates a property named _allHandlers on * the window object and creates a property named _handlers on any element on * which a handler is registered. */var Handler = {};// In DOM-compliant browsers, our functions are trivial wrappers around// addEventListener() and removeEventListener().if (document.addEventListener) { Handler.add = function(element, eventType, handler) { element.addEventListener(eventType, handler, false); }; Handler.remove = function(element, eventType, handler) { element.removeEventListener(eventType, handler, false); };}?? 快捷鍵說明
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