extjs EditorGridPanel 编辑保存数据

var editGridPanel = new Ext.grid.EditorGridPanel({
           cm: cm,
           store: store,
           autoScroll: true,
           frame: true,
           region: 'center',
           clicksToEdit: 1,
            tbar:[
                comboTerm, comboExamName
            ],
           listeners: {
               "afteredit": function(e) {
                   var r = e.record; //得到当前行所有数据
                   var f = e.field; //得到修改列
                   var v = e.value; //得到修改列修改后值
                   if (v == "") {
                       editGridPanel.getStore().reload();
                       return;
                   }
                   //通过ajax请求修改数据
                   Ext.Ajax.request({
                       url: "StuScoreAjax.ashx?model=update",
                       method: "POST",
                       params: {
                           FieldName: f,
                           UpdateValue: v,
                           ID: r.data.ID
                       },
                       success: function(r) {
                           editGridPanel.getStore().reload();
                       },
                       failure: function() {
                           MessageBox("提示", "操作失败！", Ext.MessageBox.ERROR);
                           editGridPanel.getStore().reload();
                       }
                   });
               }
           }
       });