一个创建XMLHttpRequest对象的js文件(适用asp,php,jsp,asp.net等)

创建XMLHttpRequest对象的js文件(适用asp,php,jsp,asp.net等) 

 

 

Ajax.js

function Ajax()
{
    var xmlHttp=null;
    if(window.XMLHttpRequest)
    {//非IE内核浏览器
        xmlHttp=new XMLHttpRequest();
    }
    else if(window.ActiveXObject)
    {//IE内核浏览器
        try
        {//IE6.0
            xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
        catch(e1)
        {
            try
            {
                xmlHttp=new ActiveXObject("MSXML2.XMLHTTP");
            }
            catch(e2)
            {
                try
                {
                    xmlHttp=new ActiveXObject("MSXML3.XMLHTTP");
                }
                catch(e3)
                {
                    alert("创建Ajax失败："+e3)
                }
            }
        }
    }
    else
    {//未知浏览器
        alert("未能识别的浏览器");
    }
    return xmlHttp;
}

 

放到创建对象的页面

<script language="javascript" type="text/javascript" src="Ajax.js"></script>

 

用asp举个例子

<script language="javascript" type="text/javascript" src="Ajax.js"></script>
<script language="javascript" type="text/javascript">
var xmlHttp=new Ajax();
function checkName()
{    
    xmlHttp.onreadystatechange=getName;
    xmlHttp.open("get","getName.asp",true);
    xmlHttp.send(null)
}

function getName()
{
    var dom=document.getElementById("name")    
    if(xmlHttp.readystate==1)
    {

        dom.value="正在连接服务器"
    }
    else if(xmlHttp.readystate==2 || xmlHttp.readystate==3)
    {

        dom.value="正在读取数据";
    }
    else if(xmlHttp.readystate==4)
    {
        if (xmlHttp.status==200)
         {

            dom.value=xmlHttp.responseText
        }
    }

}

</script>