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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 8-7 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 8-7 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>// // This function implements a breakpoint. It repeatedly prompts the user// for an expression, evaluates it with the supplied self-inspecting closure,// and displays the result. It is the closure that provides access to the// scope to be inspected, so each function must supply its own closure.// // Inspired by Steve Yen's breakpoint() function at// http://trimpath.com/project/wiki/TrimBreakpoint//function inspect(inspector, title) { var expression, result; // You can use a breakpoint to turn off subsequent breakpoints by // creating a property named "ignore" on this function. if ("ignore" in arguments.callee) return; while(true) { // Figure out how to prompt the user var message = ""; // If we were given a title, display that first if (title) message = title + "\n"; // If we've already evaluated an expression, display it and its value if (expression) message += "\n" + expression + " ==> " + result + "\n"; else expression = ""; // We always display at least a basic prompt: message += "Enter an expression to evaluate:"; // Get the user's input, displaying our prompt and using the // last expression as the default value this time. expression = prompt(message, expression); // If the user didn't enter anything (or clicked Cancel), // they're done and so we return, ending the breakpoint. if (!expression) return; // Otherwise, use the supplied closure to evaluate the expression // in the scope that is being inspected. // The result will be displayed on the next iteration. result = inspector(expression); }}</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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