EXT4两种方法实加载(实例化)类

例如:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <title>Untitled Document</title>
        <link rel="stylesheet" type="text/css" href="../extjs/resources/css/ext-all.css" />
        <script type="text/javascript" src="../extjs/bootstrap.js">
        </script>
        <script type="text/javascript">
            Ext.onReady(function() {
            var tree = Ext.create('Ext.tree.Panel', {
                title: 'Simple Tree',
                renderTo: 'treeDiv',
                root: {
                    text: 'Root',
                    expanded: true,
                    children: [{
                        text: 'Child 1',
                        leaf: true
                    }, {
                        text: 'Child 2',
                        leaf: true
                    }]
                }
            });


               var tree2 = new Ext.tree.Panel({
                title: 'Simple Tree',
                renderTo: 'treeDiv2',
                root: {
                    text: 'Root',
                    expanded: true,
                    children: [{
                        text: 'Child 1',
                        leaf: true
                    }, {
                        text: 'Child 2',
                        leaf: true
                    }]
                }
            });
          });


        </script>
    </head>
    <body>
        <div id="treeDiv"></div>
        <div id="treeDiv2"></div>
    </body>
</html>

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