ajax function createXMLHttpRequest(){ try{ //throw("error");//手动抛出一个错误， return new window.XMLHttpRequest();//上面手动抛出了错误，所以该句不执行 }catch(e){//捕捉错误 try{ //throw("error"); return new ActiveXObiect("MSXML2.XMLHTTP.6.0"); }catch(e){ try{ //throw("error"); return new ActiveXObiect("MSXML2.XMLHTTP.3.0"); }catch(e){ try{ //throw("error"); return new ActiveXObiect("MSXML2.XMLHTTP"); }catch(e){ if(window.confirm("浏览器版本太低，是否下载新版本")){ window.location.href="http://download.firefox.com.cn" } } } } } } function aja(){ var _ajax = createXMLHttpRequest(); if(_ajax){ _ajax.onreadystatechange = function(){ if(_ajax.readyState == 4) { alert(_ajax.responseText); } } _ajax.open("get", "text1.txt", true);
_ajax.send(null);
}
}
function ajax2(){
var _ajax = createXMLHttpRequest();
if(_ajax){
_ajax.onreadystatechange = function(){
if(_ajax.readyState == 4) {
alert(_ajax.responseText);
}
}
_ajax.open("get", "ajax1.html", true);
_ajax.send(null);
}
}
function ajax3(){
var _ajax = createXMLHttpRequest();
if(_ajax){
_ajax.onreadystatechange = function(){
if(_ajax.readyState == 4) {
alert(_ajax.responseText);
}
}
_ajax.open("get", "a.js", true);
_ajax.send(null);
}
}
function demo(_obj){
alert(_obj);
}
window.onload=function(){
aja();
ajax2();
ajax3();
ajaxRequest("post","text2.txt",null,demo,true);
ajaxRequest("post","text1.txt",null,function(data){
alert(data);
},true);
}
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