jquery ajax 登录验证实现代码_jquery

function verify()
{
var paramObj=encodeURI(encodeURI($( "#username" ).val()));
$.get( "TestSvlt?username=" +paramObj, null ,callback);
}
function callback(data)
{
var resultObj=$( "#result" );
resultObj.html(data);
}

response.setContentType( "text/html;charset=utf-8" );
PrintWriter out=response.getWriter();
String name=request.getParameter( "username" );
String username= URLDecoder.decode (name, "UTF-8" );
System. out .println(username);
if ( null ==username|| "" .equals(username))
{
out.print( "username is not null" );
}
else
{
if (! "lej" .equals(username))
{
out.print(username+ " not existing" );
}
else {
out.print(username+ " login successs" );
}
}