Java servlet ajax

AJAX is the art of exchanging data with a server and updating parts of a web page without reloading the entire page.

AJAX = Asynchronous JavaScript and XML.

AJAX is a technology for creating fast, dynamic web pages.

## function lnTest() {

var ur_loginName = document.getElementById("ur_loginName").value;
var login = document.getElementById("login" );
var id = "${sessionScope.user.ur_id}";
var ymsz = /^[A-Za-z0-9]+$/;
var loginname = document.getElementById( "loginname").value;
if(loginname==ur_loginName){
return true;
}else if (kong.test(ur_loginName)) {
login.style.color = "red ";
                                                                                                                     # xml.open("get", "AJAXServlet.do", true);
xml.setRequestHeader("name", ur_loginName);
xml.setRequestHeader("ur_id", id);
x ml .send(null);
                     ;
            var login = document.getElementById( "login");
if (msg == 1) {
Login.style.color = "red";
Login.innerhtml = "× The user name has been used";
Return false; nerHTML = " √ This username can be used";
                                              return true;
                                                           Login.style.color = "red";
Login.innerHTML = " × The account format is not Correct ":
Return false;
}
}
## Use ajax to dynamically update the username when clicking the Input box to determine whether the input user name exists

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