案例：Extjs案例     状态：可编辑再运行    进入竖版
 运行结果　
AخA
 
1
<!DOCTYPE html>
2
<html>
3
<head>
4
   <link href="//cdn.bootcss.com/extjs/6.2.0/classic/theme-classic/resources/theme-classic-all.css" rel="stylesheet" />
5
   <script type="text/javascript" src="//cdn.bootcss.com/extjs/6.2.0/ext-all.js"></script>
6
   <script type="text/javascript">
7
      Ext.onReady(function() {
8
         Ext.create('Ext.Button', {
9
            renderTo: Ext.getElementById('msgBox'),
10
            text: 'Click Me',
11
            listeners: {
12
               click: function() {
13
                  Ext.Msg.alert('Title', 'Basic message box in ExtJS');
14
               }
15
            }
16
         });
17
      });
18
   </script>
19
</head>
20
<body>
21
   <p> Click the button for alert box </p>
22
   <div id = "msgBox" ></div>
23
</body>
24
</html>