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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 17-7 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 17-7 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>/* * runOnLoad.js: portable registration for onload event handlers. * * This module defines a single runOnLoad() function for portably registering * functions that can be safely invoked only when the document is fully loaded * and the DOM is available. * * Functions registered with runOnLoad() will not be passed any arguments when * invoked. They will not be invoked as a method of any meaningful object, and * the this keyword should not be used. Functions registered with runOnLoad() * will be invoked in the order in which they were registered. There is no * way to deregister a function once it has been passed to runOnLoad(). * * In old browsers that do not support addEventListener() or attachEvent(), * this function relies on the DOM Level 0 window.onload property and will not * work correctly when used in documents that set the onload attribute * of their <body> or <frameset> tags. */function runOnLoad(f) { if (runOnLoad.loaded) f(); // If already loaded, just invoke f() now. else runOnLoad.funcs.push(f); // Otherwise, store it for later}runOnLoad.funcs = []; // The array of functions to call when the document loadsrunOnLoad.loaded = false; // The functions have not been run yet.// Run all registered functions in the order in which they were registered.// It is safe to call runOnLoad.run() more than once: invocations after the// first do nothing. It is safe for an initialization function to call// runOnLoad() to register another function.runOnLoad.run = function() { if (runOnLoad.loaded) return; // If we've already run, do nothing for(var i = 0; i < runOnLoad.funcs.length; i++) { try { runOnLoad.funcs[i](); } catch(e) { /* An exception in one function shouldn't stop the rest */ } } runOnLoad.loaded = true; // Remember that we've already run once. delete runOnLoad.funcs; // But don't remember the functions themselves. delete runOnLoad.run; // And forget about this function too!};// Register runOnLoad.run() as the onload event handler for the windowif (window.addEventListener) window.addEventListener("load", runOnLoad.run, false);else if (window.attachEvent) window.attachEvent("onload", runOnLoad.run);else window.onload = runOnLoad.run;</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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