Ext4.0.7使用Ext.grid.ColumnModel报错：TypeError: Ext.grid.Model is not a constructor

代码如下：

Ext.onReady(function(){
    　　　　　　　//定义列
                var cm = new Ext.grid.ColumnModel([
                    {header: \'编号\', dataIndex: \'id\'},
                    {header: \'名称\', dataIndex: \'name\'},
                    {header: \'描述\', dataIndex: \'des\'}
                ]);
                
                //数据定义
                var data = [
                    [\'1001\',\'name1\',\'description1\'],
                    [\'1002\',\'name1\',\'description1\'],
                    [\'1003\',\'name1\',\'description1\'],
                    [\'1004\',\'name1\',\'description1\'],
                    [\'1005\',\'name1\',\'description1\']
                ];
                
                //数据源定义
                var store = new Ext.data.Store({
                    proxy: new Ext.data.MemoryProxy(data),
                    reader: new Ext.data.ArrayReader({},[
                        {name: \'id\'},
                        {name: \'name\'},
                        {name: \'des\'}
                    ])
                });
                store.load();
                
                //grid panel
                var grid = new Ext.grid.GridPanel({
                    renderTo: Ext.getBody(),
                    store: store,
                    cm: cm
                });
});

google了一下：In Extjs 4.0 ,there is no colModel config for GridPanel(http://www.sencha.com/forum/showthread.php?199720-Ext.grid.ColumnModel-is-not-a-constructor)然后查看其API：其用法如下

Ext.onReady(function(){
　　　　　　　　Ext.create(\'Ext.data.Store\', {
                    storeId: \'simpleStore\',
                    fields: [\'name\', \'email\', \'phone\'],
                    data:{
                        \'items\':[
                            {\'name\':\'yanshiying\', \'email\':\'email\', \'phone\':\'1234567890\'},
                            {\'name\':\'yanshiying\', \'email\':\'email\', \'phone\':\'1234567890\'},
                            {\'name\':\'yanshiying\', \'email\':\'email\', \'phone\':\'1234567890\'}
                        ]
                    },
                    proxy: {
                        type: \'memory\',
                        reader: {
                            type: \'json\',
                            root: \'items\'
                        }
                    }    
                });
                
                Ext.create(\'Ext.grid.Panel\', {
                    title: \'Simple\',
                    store: Ext.data.StoreManager.lookup(\'simpleStore\'),
                    columns: [
                        {header: \'Name\', dataIndex: \'name\'},
                        {header: \'Email\', dataIndex: \'email\'},
                        {header: \'Phone\', dataIndex: \'phone\'}
                    ],
                    height: 200,
                    width: 400,
                    renderTo: Ext.getBody()
                });
})

运行效果：