已删除

var net=new Object();
net.READY_STATE_UNINITIALIZED=0;
net.READY_STATE_LOADING=1;
net.READY_STATE_LOADED=2;
net.READY_STATE_INTERACTIVE=3;
net.READY_STATE_COMPLETE=4;
net.ContentLoader=function(URL,onload,onerror){//构造函数
this.url=URL;
this.req=null;
this.onload=onload;
this.onerror=(onerror)?onerror:this.defaultError;
this.loadXMLDoc(URL);
}
net.ContentLoader.prototype={
loadXMLDoc:function(URL){
if(window.XMLHttpRequest){
this.req=new XMLHttpRequest();
}else if(window.ActiveXObject){
this.req=new ActiveXObject("Microsoft.XMLHTTP");
}
if(this.req){
try{
var loader=this;
this.req.onreadystate=function(){
loader.onReadyState.call(loader);
}
this.req.open("GET",URL,true);
this.req.send(null);
}catch(err){
this.onerror.call(this);
}
}
},
onReadyState:function(){
var req=this.req;
var ready=req.readyState;
if(ready==net.READY_STATE_COMPLETE){
var httpStatus=req.status;
if(httpStatus==200 || httpStatus==0){
this.onload.call(this);
}else{
this.onerror.call(this);
}
}
},
defaultError:function(){
alert("error fetching data!!!\n\nreadyState: "+this.req.readyState+"\nstatus: "+this.req.status+"\nheaders:"+this.req.getAllResponseHeaders());

}
}