Angular自动双向绑定值

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
</head>
<body>
    <div ng-app="myApp" ng-controller="formCtrler">
        <form novalidate>
        Name:<br>
        <input type="text" ng-model="user.Name"><br>
        Email:<br>
        <input type="text" ng-model="user.Email">
        <br>
        <br>
        <button ng-click="reset()">
            RESET</button>
        </form>
        <p>
            form = {{user }}</p>
        <p>
            master = {{master}}</p>
    </div>
</body>
<script type="text/javascript" src="http://apps.bdimg.com/libs/angular.js/1.2.15/angular.min.js"></script>
<script type="text/javascript">
    var app = angular.module("myApp", []);
    app.controller("formCtrler", function ($scope) {
        $scope.master = { "firstName": '123', "lastName": '456' };

        $scope.reset = function () {
            $scope.user = angular.copy($scope.master);
        };
        //注册事件之后调用为model赋值
        $scope.reset();
    });
</script>
</html>