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Ajax post Êý¾ÝÈçºÎ½ÓÊÜ

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HTML code:
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
<script type="text/javascript">

var xmlHttp;
function createXMLHttpRequest() {
if (window.ActiveXObject) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
else if (window.XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();

}
}
function createQueryString() {
var MName = document.getElementById("TxtUserName").value;
var MPwd = document.getElementById("txtPwd").value;
var str = "Name=" + MName + "&Pwd=" + MPwd;
return str;
}

function doRequestUsingPOST() {
createXMLHttpRequest();
var url = "NewsInfo.aspx";
var queryString = createQueryString();
xmlHttp.open("POST", url, true);
xmlHttp.onreadystatechange = handleStateChange;
xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencode;");
xmlHttp.send(queryString);
}
function handleStateChange() {
if (xmlHttp.


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