一份老外写的XMLHttpRequest代码多浏览器支持兼容性.doc

一份老外写的XMLHttpRequest代码多浏览器支持兼容性这几天要构思用Javascript调用Asp.Net的WebService，需要到XMLHTTP来支持，但发现Opera的XMLHttpRequest很烂，实在支持不下去，后来到处找，终于发现这份代码，在Opera中是利用.URL等类来实现的，不敢独享，特发上来与大家同乐。复制此代码CODE:/* Cross-Browser XMLHttpRequest v1.2 = Emulate Gecko XMLHttpRequest() functionality in IE and Opera. Opera requires the Sun Java Runtime Environment . by Andrew Gregory .au/family/andrew/webdesign/xmlhttprequest/ This work is licensed under the Creative Commons Attribution License. To view a copy of this license, visit /licenses/by-sa/2.5/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA. Attribution: Leave my name and web address in this script intact. Not Supported in Opera - * user/password authentication * responseXML data member Not Fully Supported in Opera - * async requests * abort() * getAllResponseHeaders(), getAllResponseHeader(header) */ / IE support if (window.ActiveXObject & !window.XMLHttpRequest) window.XMLHttpRequest = function() var msxmls = new Array( Msxml2.XMLHTTP.5.0, Msxml2.XMLHTTP.4.0, Msxml2.XMLHTTP.3.0, Msxml2.XMLHTTP, Microsoft.XMLHTTP); for (var i = 0; i msxmls.length; i+) try return new ActiveXObject(msxmlsi); catch (e) return null; ; / Gecko support /* ;-) */ / Opera support if (window.opera & !window.XMLHttpRequest) window.XMLHttpRequest = function() this.readyState = 0; / 0=uninitialized,1=loading,2=loaded,3=interactive,4=complete this.status = 0; / HTTP status codes this.statusText = ; this._headers = ; this._aborted = false; this._async = true; this._defaultCharset = ISO-8859-1; this._getCharset = function() var charset = _defaultCharset; var contentType = this.getResponseHeader(Content-type).toUpperCase(); val = contentType.indexOf(CHARSET=); if (val != -1) charset = contentType.substring(val); val = charset.indexOf(;); if (val != -1) charset = charset.substring(0, val); val = charset.indexOf(,); if (val != -1) charset = charset.substring(0, val); return charset; ; this.abort = function() this._aborted = true; ; this.getAllResponseHeaders = function() return this.getAllResponseHeader(*); ; this.getAllResponseHeader = function(header) var ret = ; for (var i = 0; i = 3) this._async = async; if (arguments.length 3) opera.postError(XMLHttpRequest.open() - user/password not supported); this.readyState = 1; if (this.onreadystatechange) this.onreadystatechange(); ; this.send = function(data) if (!navigator.javaEnabled() alert(XMLHttpRequest.send() - Java must be installed and enabled.); return; if (this._async) setTimeout(this._sendasync, 0, this, data); / this is not really asynchronous and wont execute until the current / execution context ends else this._sendsync(data); this._sendasync = function(req, data) if (!req._aborted) req._sendsync(data); ; this._sendsync = function(data) this.readyState = 2; if (this.onreadystatechange) this.onreadystatechange(); / open connection var url = new .URL(new .URL(window.location.href), this.url); var conn = url.openConnection(); for (var i = 0; i this._headers.length; i+) conn.setRequestProperty(this._headersi.h, this._headersi.v); this._headers = ; if (this.method = POST) / POST data conn.setDoOutput(true); var wr = new java.io.OutputStreamWriter(conn.getOutputStream(), this._getCharset(); wr.write(data); wr.flush(); wr.close(); / read response headers / NOTE: the getHeaderField() methods always return nulls for me :( var gotContentEncoding = false; var gotContentLength = false; var gotContentType = false; var gotDate = false; var gotExpiration = false; var gotLastModified = false; for (var i = 0; ; i+) var hdrName = conn.getHeaderFieldKey(i); var hdrValue = conn.getHeaderField(i); if (hdrName = null & hdrValue = null) break; if (hdrName != null) this._headersthis._headers.length = h:hdrName, v:hdrValue; switch (hdrName.toLowerCase() case content-encoding: gotContentEncoding = true; break; case content-length : gotContentLength = true; break; case content-type : gotContentType = true; break; case date : gotDate = true; break; case expires : gotExpiration = true; break; case last-modified : gotLastModified = true; break; / try to fill in any missing header information var val; val = conn.getContentEncoding(); if (val != null & !gotContentEncoding) this._headersthis._headers.length = h:Content-encoding, v:val; val = conn.getContentLength(); if (val != -1 & !gotContentLength) this._headersthis._headers.length = h:Content-length, v:val; val = conn.getContentType(); if (val != null & !gotContentType) this._headersthis._headers.length = h:Content-type, v:val; val = conn.getDate(); if (val != 0 & !gotDate) this._headersthis._headers.length = h:Date, v:(new Date(val).toUTCString(); val = conn.getExpiration(); if (val != 0 & !gotExpiration) this._headersthis._headers.length = h:Expires, v:(new Date(val).toUTCString(); val = conn.getLastModified(); if (val != 0 & !gotLastModified) this._headersthis._headers.length = h:Last-modified, v:(new Date(val).toUTCString(); / read response data var reqdata = ; var stream = conn.getInputStream(); if (stream) var reader = new java.io.BufferedReader(new java.io.InputStreamReader(stream, this._getCharset(); var line; while (line = reader.readLine() != null) if (this.readyState = 2) this.readyState = 3; if (this.onreadystatechange) this.onreadystatechange(); reqdata += line + n; reader.close(); this.status = 200; this.statusText = OK; this.responseText = reqdata; this.rea