典型的ajax读取实例

IQ>=0.5

var req=null;
var console=null;
var READY_STATE_UNINITIALIZED=0;
var READY_STATE_LOADING=1;
var READY_STATE_LOADED=2;
var READY_STATE_INTERACTION=3;
var READY_STATE_COMPLETE=4;
function sendRequest(url,params,HttpMethod){
if(!HttpMethod){
  HttpMethod="GET";
}
if(params=="undefined"){
  params=null;
}
req=initXMLHTTPRequest();
if(req){
  req.onreadystatechange=onReadyState;
  req.open(HttpMethod,url,true);
  req.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
  req.send(params);
}
}
function initXMLHTTPRequest(){
var xRequest=null;
if(window.XMLHttpRequest){
  xRequest=new XMLHttpRequest();
}else if(window.ActiveXObject){
  xRequest=new ActiveXObject("Microsoft.XMLHTTP");
}
return xRequest;
}
function onReadyState(){
var ready=req.readyState;
var data=null;
if(ready==READY_STATE_COMPLETE){
  data=req.responseText;
}else{
  data="Loading..["+ready+"]";
}
toConsole(data);
}
function toConsole(data){
if(console!=null){
  var newline=document.createElement("div");
  console.appendChild(newline);
  var txt=document.createTextNode(data);
  newline.appendChild(txt);
}
}
window.onload=function(){
console=document.getElementById('console');
sendRequest("D:\\gzm\\general.cfg.xml");
}


本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/25869/showart_447395.html