使用ASP.NET AJAX无刷新验证用户的代码

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function Login() {  var uid = $get("txtUserName").value;  var pwd = $get("txtPassword").value;  Sys.Services.AuthenticationService.login(   uid,pwd,false,null,null,   OnLoginCompleted,OnLoginFailure,null);}function OnLoginCompleted(isValid,userContext, methodName) {  if (isValid) {    alert("You logged in!");  }  else {    alert("Login failed.");  }}function OnLoginFailure(error, userContext, methodName){  alert("Attempt failed: " + error.get_message());}