function switchRown() { var rowIndex = 1; var nextRowIndex = rowIndex + 1; if (nextRowIndex >= 13) { nextRowIndex = 1; } var rown = this.options.form.getWidgetByName("rown"); rown.setValue(nextRowIndex); } var intervalId = setInterval(switchRown, 4000);想实现每隔4秒改变控件的值,一直报错。this.options.form. 改成 _g(). 还是不行。报错信息如下: