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', {
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            renderTo: 'helloWorldPanel',
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            height: 100,
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            width: 200,
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            title: 'Hello world',
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            html: 'First Ext JS Hello World Program'
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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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      <div id="helloWorldPanel"></div>
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   </body>
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</html>