<html>
<body>
<div ng-app="" ng-init="firstName='John'">
<p>在输入框中尝试输入:</p>
<p>姓名: <input type="text" ng-model="firstName"></p>
<p>你输入的为: {{ firstName }}</p>
</div>
<script src="https://libs.baidu.com/angular.js/1.2.5/angular.min.js"></script>
</body>
</html>