Extjs.panel.Panel赋值的问题

  var panel1 = Ext.create(‘Ext.panel.Panel‘, {
                id: ‘p1‘,
                autoScroll: true
                
            });

var maGrid = Ext.create("Ext.grid.Panel", {
                store: Ext.data.StoreManager.lookup("evidenceIdentificationStore"),
                columns: {
                    items: [
                           { text: ‘鉴定科目‘, dataIndex: ‘ISubject‘ },
                           { text: ‘案件名称‘, dataIndex: ‘CName‘ },
                           { text: ‘物证名称‘, dataIndex: ‘EName‘ }
                    ],
                    defaults: {}
                },
            
                stripeRows: true,//斑马线效果
                forceFit: false,
                layout: ‘fit‘,
                enableLocking: true
            });

    maGrid.on("itemdblclick", function (view, record, html, index, e, eObj) {
                Ext.Ajax.request({
                    url: "/controler/evidenceIdentification.ashx?operate=another&IId=" + record.get("IId")+"",
                    method: ‘post‘,
                    success: function (response, options) {
                        var arr = [];
                        arr = Ext.decode(response.responseText);
                       // alert(arr);
                       // document.getElementById("p1").innerHTML = arr;这样赋值没有滚动条 
                      var tt =  Ext.getCmp(‘p1‘).body.update(arr);
                       // Ext.MessageBox.alert(‘成功‘, ‘从服务端获取结果: ‘ + response.responseText);
                    },
                    failure: function (response, options) { Ext.MessageBox.alert(‘失败‘, ‘请求超时或网络故障,错误编号：‘ + response.status); }
                });
               
            });