var app = angular.module('MainApp', []);

app.controller('MainCtrl', function($scope) {
  $scope.name = 'AngularJS';
});
<!DOCTYPE html>
<html ng-app="MainApp">

<head>
  <meta charset="utf-8" />
  <title>2.双方向データバインディング</title>
  <link rel="stylesheet" href="style.css" />
  <script data-require="angular.js@1.4.x" src="https://code.angularjs.org/1.4.8/angular.js" data-semver="1.4.8"></script>
  <script src="app.js"></script>
</head>

<body ng-controller="MainCtrl">
  <input type="text" ng-model="name">
  <div ng-bind="name"></div>
</body>

</html>
/* Put your css in here */