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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         win = new Ext.Window({
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            title:'Email Window',
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            layout:'form',
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            width:400,
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            closeAction:'close',
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            target : document.getElementById('buttonId'),
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            plain: true,
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            items: [{
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               xtype : 'textfield',
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               fieldLabel: 'To'
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            },{
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               xtype : 'textfield',
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               fieldLabel: 'CC'
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            },{
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               xtype : 'textfield',
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               fieldLabel: 'BCC'
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            },{
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               xtype : 'textfield',
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               fieldLabel: 'Subject'
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            },{
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               xtype : 'textarea',
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               fieldLabel: 'Email Message'
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            }],
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            buttons: [{
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               text: 'Save Draft',
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               handler: function(){Ext.Msg.alert('Save Draft', 'Your msg is saved');}
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            },{
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               text: 'Send',
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               handler: function(){Ext.Msg.alert('Message Sent', 'Your msg is sent');}
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            },{
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               text: 'Cancel',
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               handler: function(){win.close(); Ext.Msg.alert('close', 'Email window is closed');}
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            }],
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            buttonAlign: 'center',
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         });
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         Ext.create('Ext.Button', {
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            renderTo: Ext.getElementById('buttonId'),
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            text: 'Click Me',
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            listeners: {
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               click: function() {
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                  win.show();