Ajax初体验--前台页面与后台的交互

<script language="javascript">

function getKQSL(){
var xmlHTTP = newXMLHttpRequest();//得到XMLHttpRequest对象
var surl="XXX.do";
xmlHTTP.open("POST",surl, false);
xmlHTTP.send("");//发送请求
if(xmlHTTP.readyState==4){
var retvalue=xmlHTTP.responseText;//得到返回值
}
xmlHTTP=null;
return retvalue;
}

function newXMLHttpRequest() {

var xmlreq = false;

if (window.XMLHttpRequest) {

// Create XMLHttpRequest object in non-Microsoft browsers
xmlreq = new XMLHttpRequest();

} else if (window.ActiveXObject) {

// Create XMLHttpRequest via MS ActiveX
try {
// 得到IE6.0+之后的XMLHttpRequest对象
xmlreq = new ActiveXObject("Msxml2.XMLHTTP");

} catch (e1) {

// Failed to create required ActiveXObject

try {
// Try version supported by older versions
// of Internet Explorer

xmlreq = new ActiveXObject("Microsoft.XMLHTTP");

} catch (e2) {

// Unable to create an XMLHttpRequest with ActiveX
}
}
}

return xmlreq;
}

</script>