大多数的客户端都采用UTF-8编码，这也是现在实现国际化最常用的编码格式
在这种情况下，实用AJAX异步获取GB2312编码的服务器端信息时，不可避免的要遇到汉字乱码问题
因为目标数据是GB2312，但XMLHttpRequest默认是用UTF-8来进行数据封装的，因此会产生乱码
相信很多人都在用轻量级的JS工具集-prototype.js，它的AJAX功能同样很出色
我也一直在用它，因此对于这个问题也一直是基于 prototype.js来考虑的
但经过多次试验，还是没能把它返回的 responseText 转成正确的编码格式
后来了解到，在XMLHttpRequest对象的 responseBody 属性中，保存了原始的数据信息
但prototype.js的AJAX功能返回的 responseBody 属性是 undefined，看来还是要自己动手了
经过近一个小时的敲打，一个短小精悍的AJAX框架腾空出世了，哈哈，不过功能还是很全的
调用方式及注释：
myAjaxCall({ url : 'xxxxx.jsp' //目标页面地址 ,params : URLEncoding('prm1=参数1&prm2=参数2') //参数串信息 ,method : 'POST' //发送方式POST or GET ,callBack : retValue //回调函数名称 ,isBody : true //是否返回 responseBody ，默认返回 responseText //,isXml : false //是否以XML格式返回数据 //,errorReport : false //发送错误时，是否弹出提示 //,attachs : {} //附加的其他参数，可传递给回调函数 }); function retValue(res,att){ var strRet = bytes2BSTR(res); alert(strRet); }
注意看其中的两个函数：
1、URLEncoding ：对参数进行编码
2、bytes2BSTR ：对返回的数据进行解码
这两个函数直接借鉴了网络上很流行的两个编码函数，不过都是用vbs写的
需要把这两个函数也附加到上面的页面里：
Function URLEncoding(vstrIn) strReturn = "" For i = 1 To Len(vstrIn) ThisChr = Mid(vStrIn,i,1) If Abs(Asc(ThisChr)) < &HFF Then strReturn = strReturn & ThisChr Else innerCode = Asc(ThisChr) If innerCode < 0 Then innerCode = innerCode + &H10000 End If Hight8 = (innerCode And &HFF00) \ &HFF Low8 = innerCode And &HFF strReturn = strReturn & "%" & Hex(Hight8) & "%" & Hex(Low8) End If Next URLEncoding = strReturn End Function Function bytes2BSTR(vIn) strReturn = "" For i = 1 To LenB(vIn) ThisCharCode = AscB(MidB(vIn,i,1)) If ThisCharCode < &H80 Then strReturn = strReturn & Chr(ThisCharCode) Else NextCharCode = AscB(MidB(vIn,i+1,1)) strReturn = strReturn & Chr(CLng(ThisCharCode) * &H100 + CInt(NextCharCode)) i = i + 1 End If Next bytes2BSTR = strReturn End Function
下面附上我写的轻量级Ajax框架 - myAjax.js 源码：
/** * Ajax工具类: myAjax * @author 网无忌(netwild) * @email inetwild@gmail.com * @qq 52100641 * @version 1.0 */ var myAjaxConfig = { "url":"" ,"params":"" ,"method":"GET" ,"callBack":function(){} ,"isXml":false ,"isBody":false ,"isCache":false ,"errorReport":true ,"statePoll":null ,"postData":null ,"attachs":{} }; function myAjaxCall(requestJson){ var attach; if(requestJson && typeof requestJson == "object"){ if(requestJson.url){myAjaxConfig.url = requestJson.url;} if(requestJson.params){myAjaxConfig.params = requestJson.params;} if(requestJson.method){myAjaxConfig.method = requestJson.method;} if(requestJson.callBack){myAjaxConfig.callBack = requestJson.callBack;} if(requestJson.isXml){myAjaxConfig.isXml = requestJson.isXml;} if(requestJson.isBody){myAjaxConfig.isBody = requestJson.isBody;} if(requestJson.isCache){myAjaxConfig.isCache = requestJson.isCache;} if(requestJson.statePoll){myAjaxConfig.statePoll = requestJson.statePoll;} if(requestJson.attachs){myAjaxConfig.attachs = requestJson.attachs;} } if(!myAjaxConfig.isCache){ var nocache = new Date().getTime(); if(myAjaxConfig.url.indexOf("?")>0){myAjaxConfig.url += "&nocache=" + nocache;} else{myAjaxConfig.url += "?nocache=" + nocache;} } var newCall = new myAjaxCore(); newCall.init(); } function myAjaxCore(){ var _self = this; var _state,_status; var _httpRequest,_attach; //////////////////////////////////////////////////// this.init = function(){ if (window.XMLHttpRequest){ _httpRequest = new XMLHttpRequest(); if (_httpRequest.overrideMimeType) _httpRequest.overrideMimeType('text/xml'); }else if (window.ActiveXObject) { var MSXML = ['MSXML2.XMLHTTP.6.0','MSXML2.XMLHTTP.3.0','MSXML2.XMLHTTP.5.0','MSXML2.XMLHTTP.4.0','MSXML2.XMLHTTP', 'Microsoft.XMLHTTP']; for(var n=0;n<MSXML.length;n++){ try { _httpRequest = new ActiveXObject(MSXML[n]); break; }catch(e){} } } with(_httpRequest) { onreadystatechange = _self.getResponse; open(myAjaxConfig.method,myAjaxConfig.url,true); if(myAjaxConfig.method == "POST" && (myAjaxConfig.params != "")){ setRequestHeader("Content-Length",myAjaxConfig.params.length); setRequestHeader("Content-Type","application/x-www-form-urlencoded"); send(myAjaxConfig.params); }else{ var textType = myAjaxConfig.isXml?"text/xml":"text/plain"; _httpRequest.setRequestHeader('Content-Type',textType); if(browser.IE) setRequestHeader("Accept-Encoding", "gzip, deflate"); else if(browser.FF) setRequestHeader("Connection","close"); send(null); } } }; //////////////////////////////////////////////////// this.getResponse = function(){ _state = _httpRequest.readyState; if(_httpRequest.readyState == 4 && _httpRequest.status){_status = _httpRequest.status;} if(myAjaxConfig.statePoll){myAjaxConfig.statePoll(_httpRequest.readyState);} if(_httpRequest.readyState==4 && _httpRequest.status>=400){ _self.abort(); _self.alertf("ERROR:HTTP response code "+_httpRequest.status); } if(_httpRequest.readyState==4 && _httpRequest.status==200){ var response_content; if(myAjaxConfig.isXML){ response_content = _httpRequest.responseXML; }else if(myAjaxConfig.isBody){ response_content = _httpRequest.responseBody; }else{ response_content = _httpRequest.responseText; } if(typeof myAjaxConfig.callBack == "function"){ myAjaxConfig.callBack(response_content,myAjaxConfig.attachs); }else{ eval(myAjaxConfig.callBack+"(response_content,myAjaxConfig.attachs)"); } } }; //////////////////////////////////////////////////// this.abort=function(){_httpRequest.abort();}; this.state=function(){return _state;}; this.status=function(){return _status;}; this.destory=function(){_self.abort();delete(_httpRequest);}; this.alertf=function(error){if(myAjaxConfig.errorReport){alert(error);}}; } if(!browser){ var browser={}; browser.IE = browser.ie = window.navigator.userAgent.indexOf("MSIE")>0; browser.Firefox = browser.firefox = browser.FF = browser.MF = navigator.userAgent.indexOf("Firefox")>0; browser.Gecko = browser.gecko = navigator.userAgent.indexOf("Gecko")>0; browser.Safari = browser.safari=navigator.userAgent.indexOf("Safari")>0; browser.Camino = browser.camino=navigator.userAgent.indexOf("Camino")>0; browser.Opera = browser.opera=navigator.userAgent.indexOf("Opera")>0; browser.other = browser.OT=!(browser.IE || browser.FF || browser.Safari || browser.Camino || browser.Opera); }
宠辱不惊，看庭前花开花落；去留无意，望天上云卷云舒