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); }

                });

            });