案例：Extjs案例     状态：可编辑再运行    进入竖版
 运行结果　
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<!DOCTYPE html>
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<html>
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<head>
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   <link href="//cdn.bootcss.com/extjs/6.2.0/classic/theme-classic/resources/theme-classic-all.css" rel="stylesheet" />
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   <script type="text/javascript" src="//cdn.bootcss.com/extjs/6.2.0/ext-all.js"></script>
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   <script type="text/javascript">
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      Ext.onReady(function() {
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         Ext.create('Ext.panel.Panel', {
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            renderTo : Ext.getBody(),
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            layout : {
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               type :'vbox',
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               align: 'stretch'
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            },
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            requires: ['Ext.layout.container.VBox'],
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            xtype: 'layout-vertical-box',
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            width : 600,
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            height :400,
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            frame :true,
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            items : [{
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               title: 'Panel 1',
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               html : 'Panel with flex 1',
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               margin: '0 0 10 0',
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               flex : 1
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            },{
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               title: 'Panel 2',
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               html : 'Panel with flex 2',
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               margin: '0 0 10 0',
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               flex : 2
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            },{
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               title: 'Panel 3',
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               flex : 2,
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               margin: '0 0 10 0',
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               html : 'Panel with flex 2'
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            },{
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               title: 'Panel 4',
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               html : 'Panel with flex 1',
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               margin: '0 0 10 0',
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               flex : 1
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            }]
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         });
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      });
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   </script>
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</head>
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<body>
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</body>
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</html>