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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 21-14 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 21-14 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 returns the exchange rate between the currencies of two * countries. It determines the exchange rate by making a SOAP request to a * demonstration web service hosted by XMethods (http://www.xmethods.net). * The service is for demonstration only and is not guaranteed to be * responsive, available, or to return accurate data. Please do not * overload XMethod's servers by running this example too often. * See http://www.xmethods.net/v2/demoguidelines.html */function getExchangeRate(country1, country2) { // In Firefox we must ask the user to grant the privileges we need to run. // We need special privileges because we're talking to a web server other // than the one that this script was served from. UniversalXPConnect // allows us to make an XMLHttpRequest to the server, and // UniversalBrowserRead allows us to look at its response. // In IE, the user must instead enable "Access data sources across domains" // in the Tools->Internet Options->Security dialog. if (typeof netscape != "undefined") { netscape.security.PrivilegeManager. enablePrivilege("UniversalXPConnect UniversalBrowserRead"); } // Create an XMLHttpRequest to issue the SOAP request. This is a utility // function defined in the last chapter var request = HTTP.newRequest(); // We're going to be POSTing to this URL and want a synchronous response request.open("POST", "http://services.xmethods.net/soap", false); // Set some headers: the body of this POST request is XML request.setRequestHeader("Content-Type", "text/xml"); // This header is a required part of the SOAP protocol request.setRequestHeader("SOAPAction", '""'); // Now send an XML-formatted SOAP request to the server request.send( '<?xml version="1.0" encoding="UTF-8"?>' + '<soap:Envelope' + ' xmlns:ex="urn:xmethods-CurrencyExchange"' + ' xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"' + ' xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"' + ' xmlns:xs="http://www.w3.org/2001/XMLSchema"' + ' xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">' + ' <soap:Body ' + ' soap:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">'+ ' <ex:getRate>' + ' <country1 xsi:type="xs:string">' + country1 + '</country1>' + ' <country2 xsi:type="xs:string">' + country2 + '</country2>' + ' </ex:getRate>' + ' </soap:Body>' + '</soap:Envelope>' ); // If we got an HTTP error, throw an exception if (request.status != 200) throw request.statusText; // This XPath query gets us the <getRateResponse> element from the document var query = "/s:Envelope/s:Body/ex:getRateResponse"; // This object defines the namespaces used in the query var namespaceMapping = { s: "http://schemas.xmlsoap.org/soap/envelope/", // SOAP namespace ex: "urn:xmethods-CurrencyExchange" // the service-specific namespace }; // Extract the <getRateResponse> element from the response document var responseNode=XML.getNode(request.responseXML, query, namespaceMapping); // The actual result is contained in a text node within a <Result> node // within the <getRateReponse> return responseNode.firstChild.firstChild.nodeValue;}</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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