<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title></title>
<link rel="stylesheet" href="">
</head>
<body>
<div ng-app="" ng-init="hour=13">
<p ng-show="true">可见</p>
<p ng-show="false">不可见</p>
<input type="text" ng-model="hour">
<p ng-show="hour > 12">{{hour}}</p>
</div>
</body>
<script src="http://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js"></script>
</html>
原文：http://suyanzhu.blog.51cto.com/8050189/1895360