PJBLOG中用到的ajaxjs.几个简单的函数

function $(id)
{
    return document.getelementbyid(id);    
}
function echo(obj,html)
{
    $(obj).innerhtml=html;
}
function fopen(obj)
{
    $(obj).style.display="";
}
function fclose(obj)
{
    $(obj).style.display="none";
}
function createxmlhttp()
{
    var xmlhttp=false;
    try    {
          xmlhttp = new activexobject("msxml2.xmlhttp");
     } 
    catch (e) {
          try {
               xmlhttp = new activexobject("microsoft.xmlhttp");
          } 
        catch (e) {
               xmlhttp = false;
         }
     }
    if (!xmlhttp && typeof xmlhttprequest!='undefined') {
          xmlhttp = new xmlhttprequest();
                if (xmlhttp.overridemimetype) {//设置mime类别
            xmlhttp.overridemimetype('text/xml');
        }
    }    

    return xmlhttp;    
}

function getdata(url,obj1,obj2)
{

        var xmlhttp=createxmlhttp();
        if(!xmlhttp)
        {
            alert("你的浏览器不支持xmlhttp！！");
            return;
        }
        xmlhttp.onreadystatechange=requestdata;
        xmlhttp.open("get",url,true);
        xmlhttp.send(null);
        function requestdata()
        {

                fopen(obj1);
                echo(obj1,"正在加载数据，请稍等......");
                if(xmlhttp.readystate==4)
                {
                    if(xmlhttp.status==200)
                    {
                        if(obj1!=obj2){fclose(obj1);};
                        echo(obj2,xmlhttp.responsetext);

                    }
                }

        }
}