var lastIndex;
            $("#subDataGrid").datagrid({
                columns: [[
                    { field: 'Payment', title: '此次还款', width: 100, editor: 'text' }
                ]],
                idField:'ID',
                toolbar: [{
                        text: '确认还款',
                        iconCls: 'icon-save',
                        handler: function () {
                            $('#subDataGrid').datagrid('acceptChanges');
                        }
                    }],
                onClickRow:function (rowIndex){
                    if (lastIndex!=rowIndex) {
                            $('#subDataGrid').datagrid('endEdit', lastIndex);
                            $('#subDataGrid').datagrid('beginEdit', rowIndex);
                     }
                     lastIndex=rowIndex;
                }
            });