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.application({
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          launch: function() {
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              var images = Ext.get('images').select('img');
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              Ext.each(images.elements, function(el) {
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                  var dd = Ext.create('Ext.dd.DD', el, 'imagesDDGroup', {
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                      isTarget: false
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                  });
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              });
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          }
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       });
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      var mainTarget = Ext.create('Ext.dd.DDTarget', 'mainRoom', 'imagesDDGroup', {
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         ignoreSelf: false
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      });
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   </script>
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   <style>
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      #content{
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         width:600px;
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         height:400px;
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         padding:10px;
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         border:1px solid #000;
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      }
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      #images{
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         float:left;
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         width:40%;
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         height:100%;
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         border:1px solid Black;
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         background-color:rgba(222, 222, 222, 1.0);
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      }
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      #mainRoom{
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         float:left;
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         width:55%;
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         height:100%;
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         margin-left:15px;
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         border:1px solid Black;
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         background-color:rgba(222, 222, 222, 1.0);
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      }
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      .image{
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         width:64px;
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         height:64px;
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         margin:10px;
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         cursor:pointer;
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         border:1px solid Black;