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function sendAsynchronRequest(url,parameter,callback){
createXMLHttpRequest();
if(parameter == null){
xmlHttp.onreadystatechange = callback;
xmlHttp.open("GET",url,true);//µ±GETÇëÇóʱ£¬ÔÚµØÖ·À¸ÖÐÊÇ´ø²ÎÊýµÄ£¬¶ø²ÎÊýΪNULL£¬ËùÒÔÓÃgetÇëÇó£¬send(null)
xmlHttp.send(null);
}else{
xmlHttp.onreadystatechange = callback;
xmlHttp.open("POST",url,true);//get
xmlHttp.setRequestHeader(
"Content-Type","application/x-www-form-urlencoded;");
xmlHttp.send(parameter);//µ±POSTÇëÇóʱ£¬ÔÚµØÖ·À¸ÖÐÊÇwu²ÎÊýµÄ£¬¶ø²ÎÊý !=NULL£¬ËùÒÔÓÃÉèÖÃΪPOSTÇëÇó£¬send(parameter)
}
}
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<mce:script type="text/javascript"><!--
function login(){
var postURL = "http://localhost:8080/cas/simpleLogin";
var params = {
"loginUrl":$("#loginUrl").val(),
"service":$("#service").val(),
"login":$( ......