javascript ajax获取信息功能代码

html>
head>
script language="javascript">!--
function getit(){
if(document.getElementById("url").value==""){
alert("Enter url!");
return false;
}
if(document.getElementById("count").value==""){
alert("Enter count!");
return false;
}
if(document.getElementById("num").value==""){
alert("Enter num!");
return false;
}
if(document.getElementById("end").value==""){
alert("Enter end!");
return false;
}
var url=document.getElementById("url").value;
var count=document.getElementById("count").value;
var num=document.getElementById("num").value;
var end=document.getElementById("end").value;
sendCall(url,count,num,end);
}
function sendCall(url,count,num,end) {
if (parseInt(num)>=parseInt(end)){return false;}
var nurl=url+"?count="+count+"num="+num;
//alert(nurl);
//window.open(nurl);
var xmlHttp;
if (window.ActiveXObject) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
} else if (window.XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();
//解决FF中跨域问题
try{
netscape.security.PrivilegeManager.enablePrivilege( "UniversalBrowserRead ");
} catch (e) {
alert( "Permission UniversalBrowserRead denied. ");
}
}

xmlHttp.onreadystatechange = function() {
if(xmlHttp.readyState == 4 xmlHttp.status ==200){
var str = xmlHttp.responseText;
var msg=document.getElementById("getmsg");
if(str.match(/thereisnothing/)) {
msg.innerHTML = "数据已经完成传输！"
}else{
//msg.innerHTML =str;
write(str,count,num);
var next=parseInt(num)+parseInt(count);
sendCall(url,count,next,end);
}
}
}

xmlHttp.open('POST', nurl, true);
//xmlHttp.setRequestHeader("Content-Type", "text/xml");
//xmlHttp.setRequestHeader("charset", "utf-8");
xmlHttp.send(null);
}
function write(str,count,num){
var fso = new ActiveXObject("Scripting.FileSystemObject");
var end = parseInt(num)+parseInt(count);
var name = "e:\\"+num+"-"+end+".txt";
var a = fso.CreateTextFile(name, true);
a.WriteLine(str);
a.Close();
//alert("我已经在你的E盘根目录下生成了一个"+name+"的文件！");
document.getElementById("num").value=end;
var msg=document.getElementById("getmsg");
msg.innerHTML="我已经在你的E盘根目录下生成了一个"+name+"的文件！";
}
// -->
/script>
/head>
body>

div>
Enter the setup then get the info:
/div>

input id="url" value="http://www.oldjun.com/test.asp" size="50">
input type=button value="开始" onclick="javascript:getit();">br>br>
div id="getmsg">
/div>

br>br>
→ how many once：input name="count" id="count" type="text" value="1000" size="30" />br>br>
→ begin num ：input name="num" id="num" type="text" value="0" size="30" />br>br>
→ end num ：input name="end" id="end" type="text" value="100" size="30" />br>br>
/body>/html>