ajax学习笔记（2）

//recvType 有两个值HTML 和 XML , 默认为HTML
function Ajax(recvType) {
var aj = new Object();
aj.targetUrl = '';    //请求的地址 可以是PHP也可以XML文件
aj.sendString = '';   //请求服务器传递的字符串  ？ & 格式 url
aj.recvType = recvType ? recvType : 'HTML';//HTML XML
aj.resultHandle = null;

aj.createXMLHttpRequest = function() {
var request = false;
if(window.XMLHttpRequest) {
request = new XMLHttpRequest();
if(request.overrideMimeType) {
request.overrideMimeType('text/xml');
}
} else if(window.ActiveXObject) {
var versions = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.7.0', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
for(var i=0; i<versions.length; i++) {
try {
request = new ActiveXObject(versions[i]);
if(request) {
return request;
}
} catch(e) {
request=false;
}
}
}
return request;
}

aj.XMLHttpRequest = aj.createXMLHttpRequest();

aj.processHandle = function() {
if(aj.XMLHttpRequest.readyState == 4) {
if(aj.XMLHttpRequest.status == 200) {
if(aj.recvType == 'HTML') {
aj.resultHandle(aj.XMLHttpRequest.responseText);
} else if(aj.recvType == 'XML') {
aj.resultHandle(aj.XMLHttpRequest.responseXML);
}
}
}
}

aj.get = function(targetUrl, resultHandle) {
aj.targetUrl = targetUrl;
if(resultHandle!=null){
aj.XMLHttpRequest.onreadystatechange = aj.processHandle;
aj.resultHandle = resultHandle;
}
if(window.XMLHttpRequest) {
aj.XMLHttpRequest.open('GET', aj.targetUrl);
aj.XMLHttpRequest.send(null);
} else {
aj.XMLHttpRequest.open("GET", targetUrl, true);
aj.XMLHttpRequest.send();
}
}

aj.post = function(targetUrl, sendString, resultHandle) {
aj.targetUrl = targetUrl;
aj.sendString = sendString;
if(resultHandle!=null){
aj.XMLHttpRequest.onreadystatechange = aj.processHandle;
aj.resultHandle = resultHandle;
}
aj.XMLHttpRequest.open('POST', targetUrl);
aj.XMLHttpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
aj.XMLHttpRequest.send(aj.sendString);
}
return aj;
}

转自：http://hi.baidu.com/yc2266/blog/item/5ab74d37cd34c3d0a2cc2b0c.html