自己获取tree的rootnode后遍历childnodes，和左边的记录中的权限对比后是否进行勾选

参考：Ext.tree.Panel显示checkbox并且级联选择或者取消选择

我的解决方案

 listeners: {
                'cellclick':function(){

                    var rows = gridType.getSelectionModel().getSelection()[0];
                    var name = rows.get('name');
                    typeid = rows.get('id');                
                    Ext.getCmp('treeName').setTitle('人员['+name+']的权限');   
                    var cc = formPanel.getSelectionModel().getStore();
                    formPanel.selModel.deselectAll();
                    ptViewStore.load({
                        params : {
                            purviewId : typeid
                        },
                        callback: function(records, options, success){ 
                            var arr = [];                               
                            ptViewStore.each(function(record){                              
                                for(var i=0;i<cc.getCount();i++){                                   
                                    var treestore = cc.getAt(i);
                                    var p = treestore.get('id');  
                                    var indexp = treestore.length;
                                    if(p == record.data.treeid){
                                        formPanel.selModel.select(i,true);
                                        break;
                                    }
                                }
                            });

                        }
                    });
                }

            }