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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>/** * http.js: utilities for scripted HTTP requests * * From the book JavaScript: The Definitive Guide, 5th Edition, * by David Flanagan. Copyright 2006 O'Reilly Media, Inc. (ISBN: 0596101996) */// Make sure we haven't already been loadedvar HTTP;if (HTTP && (typeof HTTP != "object" || HTTP.NAME)) throw new Error("Namespace 'HTTP' already exists");// Create our namespace, and specify some meta-informationHTTP = {};HTTP.NAME = "HTTP"; // The name of this namespaceHTTP.VERSION = 1.0; // The version of this namespace// This is a list of XMLHttpRequest creation factory functions to tryHTTP._factories = [ function() { return new XMLHttpRequest(); }, function() { return new ActiveXObject("Msxml2.XMLHTTP"); }, function() { return new ActiveXObject("Microsoft.XMLHTTP"); }];// When we find a factory that works, store it hereHTTP._factory = null;/** * Create and return a new XMLHttpRequest object. * * The first time we're called, try the list of factory functions until * we find one that returns a nonnull value and does not throw an * exception. Once we find a working factory, remember it for later use. */HTTP.newRequest = function() { if (HTTP._factory != null) return HTTP._factory(); for(var i = 0; i < HTTP._factories.length; i++) { try { var factory = HTTP._factories[i]; var request = factory(); if (request != null) { HTTP._factory = factory; return request; } } catch(e) { continue; } } // If we get here, none of the factory candidates succeeded, // so throw an exception now and for all future calls. HTTP._factory = function() { throw new Error("XMLHttpRequest not supported"); } HTTP._factory(); // Throw an error}/** * Use XMLHttpRequest to fetch the contents of the specified URL using * an HTTP GET request. When the response arrives, pass it (as plain * text) to the specified callback function. * * This function does not block and has no return value. */HTTP.getText = function(url, callback) { var request = HTTP.newRequest(); request.onreadystatechange = function() { if (request.readyState == 4 && request.status == 200) callback(request.responseText); } request.open("GET", url); request.send(null);};/** * Use XMLHttpRequest to fetch the contents of the specified URL using * an HTTP GET request. When the response arrives, pass it (as a parsed * XML Document object) to the specified callback function. * * This function does not block and has no return value. */HTTP.getXML = function(url, callback) { var request = HTTP.newRequest(); request.onreadystatechange = function() { if (request.readyState == 4 && request.status == 200) callback(request.responseXML); } request.open("GET", url); request.send(null);};/** * Use an HTTP HEAD request to obtain the headers for the specified URL. * When the headers arrive, parse them with HTTP.parseHeaders() and pass the * resulting object to the specified callback function. If the server returns * an error code, invoke the specified errorHandler function instead. If no * error handler is specified, pass null to the callback function. */HTTP.getHeaders = function(url, callback, errorHandler) { var request = HTTP.newRequest(); request.onreadystatechange = function() { if (request.readyState == 4) { if (request.status == 200) { callback(HTTP.parseHeaders(request)); } else { if (errorHandler) errorHandler(request.status, request.statusText); else callback(null); }⌨️ 快捷键说明
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