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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 20-7 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 20-7 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>/** * Send an HTTP GET request for the specified URL. If a successful * response is received, it is converted to an object based on the * Content-Type header and passed to the specified callback function. * Additional arguments may be specified as properties of the options object. * * If an error response is received (e.g., a 404 Not Found error), * the status code and message are passed to the options.errorHandler * function. If no error handler is specified, the callback * function is called instead with a null argument. * * If the options.parameters object is specified, its properties are * taken as the names and values of request parameters. They are * converted to a URL-encoded string with HTTP.encodeFormData() and * are appended to the URL following a '?'. * * If an options.progressHandler function is specified, it is * called each time the readyState property is set to some value less * than 4. Each call to the progress handler function is passed an * integer that specifies how many times it has been called. * * If an options.timeout value is specified, the XMLHttpRequest * is aborted if it has not completed before the specified number * of milliseconds have elapsed. If the timeout elapses and an * options.timeoutHandler is specified, that function is called with * the requested URL as its argument. **/HTTP.get = function(url, callback, options) { var request = HTTP.newRequest(); var n = 0; var timer; if (options.timeout) timer = setTimeout(function() { request.abort(); if (options.timeoutHandler) options.timeoutHandler(url); }, options.timeout); request.onreadystatechange = function() { if (request.readyState == 4) { if (timer) clearTimeout(timer); if (request.status == 200) { callback(HTTP._getResponse(request)); } else { if (options.errorHandler) options.errorHandler(request.status, request.statusText); else callback(null); } } else if (options.progressHandler) { options.progressHandler(++n); } } var target = url; if (options.parameters) target += "?" + HTTP.encodeFormData(options.parameters) request.open("GET", target); request.send(null);};</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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