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<script type="text/javascript">
var request;
function createRequest(){
if(window.ActiveXObject){
request = new ActiveXObject("Microsoft.XMLHTTP");
}else{
request = new XMLHttpRequest();
}
}
function checkID(){
var id = $("#id").val();
var url = "servlet/CheckID?id=" + id;
createRequest();
request.open("post", url, true);
request.onreadystatechange = processResponse;
request.send(null);
}
function processResponse(){
var res = request.responstText;
if(request.readyState == 4){
if(request.status == 200){
if(res == "success"){
alert("ID已经存在!");
}
}
}else{
alert("请求出现异常!");
}
}
$("#regist").click(function(){
alert("注册");
});
$("#submits").click(function(){
$("#loginForm")[0].submit();
});
</script>
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter pw = response.getWriter();
System.out.println(request.getParameter("id"));
pw.print("success");
return;
}
function checkID(){
var id = $("#id").val();
var url = "/servlet/CheckID?id=" + id;
alert(url);
createRequest();
request.open("post", url, true);
request.onreadystatechange = processResponse;
request.send(null);
}
function processResponse(){
if(request.readyState == 4){
if(request.status == 200){
var res = request.responseText.replace(/(^\s*)|(\s*$)/g,"");
if(res == "success"){
alert("ID已经存在!");
}else{
alert("可以注册!");
}
}else if(request.status == 404){
alert("url不存在!");
}else{
alert("请求出现异常!");
}
}
}
function checkID(){
var id = $("#id").val();
var url = "/servlet/CheckID?id=" + id;
alert(url);
createRequest();
request.open("post", url, true);
request.onreadystatechange = processResponse;
request.send(null);
}
function processResponse(){
if(request.readyState == 4){
if(request.status == 200){
var res = request.responseText.replace(/(^\s*)|(\s*$)/g,"");
if(res == "success"){
alert("ID已经存在!");
}else{
alert("可以注册!");
}
}else if(request.status == 404){
alert("url不存在!");
}else{
alert("请求出现异常!");
}
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/xml");
response.setHeader("Cache-Control", "no-cache");
PrintWriter pw = response.getWriter();
System.out.println(request.getParameter("id"));
pw.print("success");
}
function processResponse(){
if(request.readyState == 4){
if(request.status == 200){
var res = request.responseText;
if(res == "success"){
alert("ID已经存在!");
}else{
alert("ID可以用");
}
}else{
alert('请求失败');
}
}
}
“alert("ID已经存在!");”