<div ng-controller="myController">
    <p><label>value a : </label><input type="text" ng-model="valuea" name="valuea" id="valuea" /></p>
    <p><label>value b  : </label><input name="valueb" id="valueb" ng-model="valueb"/></p>

    <button type="button" ng-click = "add()"  >Sign In</button>
</div>

<script>
   angular.module('myApp', [])
   .controller('myController', ['$scope', function($scope) {
   function myController($scope) {
       $scope.add = function(){
           alert("valuea:"+$scope.valuea);
           alert("valueb:"+$scope.valueb);
       }
   };
}]);