<div ng-app="myApp" ng-controller="myCtrl">
 
名: <input type="text" ng-model="firstName"><br>
姓: <input type="text" ng-model="lastName"><br>
<br>
姓名: {{firstName + " " + lastName}}
 
</div>
 
<script>
var app = angular.module('myApp',[]);
app.controller('myCtrl',function($scope) {
    $scope.firstName= "John";
    $scope.lastName= "Doe";
});
</script>