浅谈AJAX开发技术(2)

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-www-form-urlencoded");
        aj.XMLHttpRequest.send(aj.sendString);
    }
    return aj;
}

使用AJAX可以完成局部刷新操作；

在AJAX中主要是通过XMLHttpRequest对象完成操作。

以上就是关于AJAX开发技术的全部内容了，希望小伙伴们能够喜欢。

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