问在extjs4中存储看不到网格上的更改

EN

store_jvhdr = new Ext.data.JsonStore({
        model: 'model_jvhdr',
        proxy: {
            type: 'ajax',
            api: {
                read: './journalservlet?batNbr='+batNbr+'&operation=GET_RECORD',
                update: './journalservlet',
                create: './journalservlet'
            },
            reader: {
                type: 'json',
                root: 'data'
            }
        },
        autoLoad: true,
        listeners: {
            load: function(store, records, successful){
                ...
            }
        }
        });

listeners: {
   itemdblclick: function(dv, record, item, index, e){
    ...
   },
   edit: function(editor, e){
      console.log('test');
      store_jvdtl.commitChanges();
      store_jvdtl.sync();
   }
}