常用的ajax的代码



/*-----------------------------

ajax关键代码

将ajax封装成一个类

-----------------------------*/

function createAjax() {

    var xmlHttp = false;

    if (window.XMLHttpRequest) {

        //mozilla

        xmlHttp = new XMLHttpRequest();//ie6不支持XMLHttpRequest

        if (xmlHttp.overrideMimeType) xmlHttp.overrideMimeType("text/xml");

    }

    else if (window.ActiveXObject) {                

        var MSXML = ['MSXML2.XMLHTTP.5.0', 'Microsoft.XMLHTTP', 'MSXML2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];

        var i;

        for(i = 0; i < MSXML.length; i++){

            try{

                xmlHttp = new ActiveXObject(MSXML[i]);

                break;

            }

            catch(e){}

        }    

    }

    if (!xmlHttp) { alert("error! fail to create an ajax instance!"); return false; }

    this.rep = xmlHttp;

    this.sendData = function(method, url, asy, fun) {

        if (asy) {

            xmlHttp.onreadystatechange = function() {

                if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {

                    fun(xmlHttp);

                }

            }

            if (method == "POST") {

                xmlHttp.open("POST", url, true);

                xmlHttp.setRequestHeader("Conent-Type", "application/x-www-form-urlencoded");

                xmlHttp.send(null);

            }

            else {

                xmlHttp.open("GET", url, true);

                xmlHttp.send(null);

            }

        }

        else {

            if (method == "POST") {

                xmlHttp.open("POST", url, false);

                xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

                xmlHttp.send(null);

            }

            else {

                xmlHttp.open("GET", url, false);

                xmlHttp.send(null);

            }

            return xmlHttp;

        }

    }

}

 

使用：

 

先实例一个对象：

   1: var ajax = new createAjax();

 

 

再写方法：

   1: ajax.sendData("POST", "articleEdit.aspx?RemoveAttachmentID=" + attachmentID + "&NewsID=" + newsID, true, function(xmlhttp) {

   2:     if (xmlhttp.responseText != "") {

   3:         

   4:     //to do something

   5:  

   6:     }

   7: })