關於UTF-8的用戶端用AJAX方式擷取GB2312的伺服器端亂碼問題的解決辦法_javascript技巧

來源:互聯網
上載者:User
用戶端是UTF-8編碼,這也是現在大家公認的標準編碼
在這種情況下,實用AJAX非同步擷取GB2312編碼的伺服器端資訊時,不可避免的要遇到漢字亂碼問題
因為目標資料是GB2312,但XMLHttpRequest預設是用UTF-8來進行資料封裝的,因此會產生亂碼
相信很多人都在用輕量級的JS工具集-prototype.js,它的AJAX功能同樣很出色
我也一直在用它,因此對於這個問題也一直是基於 prototype.js來考慮的
但經過多次實驗,還是沒能把它返回的 responseText 轉成正確的編碼格式
後來瞭解到,在XMLHttpRequest對象的 responseBody 屬性中,儲存了原始的資料資訊
但prototype.js的AJAX功能返回的 responseBody 屬性是 undefined,看來還是要自己動手了
經過近一個小時的敲打,一個短小精悍的AJAX架構騰空出世了,哈哈,不過功能還是很全的
裡面某些寫法借鑒了另一個輕量級的AJAX架構-bingo.js的實現方式
調用方式及注釋:
複製代碼 代碼如下:

myAjaxCall({
url : 'xxxxx.jsp' //目標頁面地址
,params : URLEncoding('prm1=參數1&prm2=參數2') //參數串資訊
,method : 'POST' //發送方式POST or GET
,callBack : retValue //回呼函數名稱
,isBody : true //是否返回 responseBody ,預設返回 responseText
//,isXml : false //是否以XML格式返回資料
//,errorReport : false //發送錯誤時,是否彈出提示
//,attachs : {} //附加的其他參數,可傳遞給回呼函數
});
function retValue(res,att){
var strRet = bytes2BSTR(res);
alert(strRet);
}

注意看其中的兩個函數:

、URLEncoding :對參數進行編碼
、bytes2BSTR :對返回的資料進行解碼

這兩個函數直接借鑒了網路上很流行的兩個編碼函數,不過都是用vbs寫的
需要把這兩個函數也附加到上面的頁面裡:
複製代碼 代碼如下:

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

下面附上我寫的輕量級Ajax架構 - myAjax.js 源碼:
複製代碼 代碼如下:

/**
2 * myAjax
3 * by netwild
4 * netwild@163.com
5 */
6 var myAjaxConfig = {
7 "url":""
8 ,"params":""
9 ,"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);
}
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