Using AJAX to implement a value instance in a script to introduce _ajax related

Page Script：

Copy Code code as follows:

function Ajaxsave (URLS) {
Defines a variable for storing XMLHttpRequest objects
var xmlhttp;
Defines a variable for storing the response returned from the server
var responsecontext = "";
if (window. XMLHttpRequest) {//code for ie7+, Firefox, Chrome, Opera, Safari
XMLHTTP = new XMLHttpRequest ();
else {//code for IE6, IE5
XMLHTTP = new ActiveXObject ("Microsoft.XMLHTTP");
}
Xmlhttp.onreadystatechange = function () {
if (xmlhttp.readystate = = 4 && xmlhttp.status = 200) {

ResponseContext = Xmlhttp.responsetext;
alert (ResponseContext);
}
}

Xmlhttp.open ("POST", URLS, True);
Xmlhttp.setrequestheader ("Content-type",
"application/x-www-form-urlencoded");
Xmlhttp.send ();
}

Background Method：

Copy Code code as follows:

Boolean Boolean1;
String reponsetext = "";
if (boolean1) {
Reponsetext= "Save success!" ";
}
else{
Reponsetext= "Save failed!" ";
}
HttpServletResponse response = Servletactioncontext.getresponse ();
Response.setcontenttype ("Text/plain");
Response.setcharacterencoding ("UTF-8");
PrintWriter out = Response.getwriter ();
Out.println (Reponsetext);
Out.flush ();
Out.close ();
return null;