本文实例讲述了一个简单Ajax类库及使用方法。分享给大家供大家参考，具体如下：

ajax.js

function Ajax(recvType){ var aj=new Object(); aj.recvType=recvType ? recvType.toUpperCase() : 'HTML' //HTML XML aj.targetUrl=''; aj.sendString=''; aj.resultHandle=null; aj.createXMLHttpRequest=function(){ var request=false; //window对象中有XMLHttpRequest存在就是非IE，包括（IE7，IE8） if(window.XMLHttpRequest){ request=new XMLHttpRequest(); if(request.overrideMimeType){ request.overrideMimeType("text/xml"); } //window对象中有ActiveXObject属性存在就是IE }else if(window.ActiveXObject){ var versions=['Microsoft.XMLHTTP', 'MSXML.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", aj.targetUrl, true); aj.XMLHttpRequest.send(); } } aj.post=function(targetUrl, sendString, resultHandle){ aj.targetUrl=targetUrl; if(typeof(sendString)=="object"){ var str=""; for(var pro in sendString){ str+=pro+"="+sendString[pro]+"&"; } aj.sendString=str.substr(0, str.length-1); }else{ 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-'}, function(data){ eval("var obj="+data); alert(obj.name); alert(obj.email); })</script>

更多关于ajax相关内容感兴趣的读者可查看本站专题：《jquery中Ajax用法总结》、《JavaScript中ajax操作技巧总结》、《PHP+ajax技巧与应用小结》和《asp.net ajax技巧总结专题》

希望本文所述对大家ajax程序设计有所帮助。