proprietà di un oggetto di un oggetto (standard)

[whisher]

function tmp() {
    this.obj=new XMLHttpRequest();
    this.cp=function () {
        if (this.obj.readyState==0) {//Uninitialized
            //
        }
        if (this.obj.readyState==1) {//Loading
            document.getElementById("mypage").innerHTML="Loading...";
        }
        if (this.obj.readyState==2) {//Loaded
            //
        }
        if (this.obj.readyState==3) {//Interactive
            //
        }
        if (this.obj.readyState==4) {//Complete
            document.getElementById("mypage").innerHTML=this.obj.responseText;
        }
    }
}

var k=new tmp();
k.obj.onreadystatechange=function(){
    k.cp();
}
try {
    k.obj.open("GET","iwdn.php",true);
    k.obj.send(null);
} catch(e) {
    alert("Problems in loading the page");
}