请问堆积柱状图只展示汇总标签,数值的千位分隔符怎么设置,因为是通过自定义写的,如果把展示的数值加千位分隔符,要怎么加目前堆积柱状图汇总数值:function() { var point = this; var points = this.points; var val = 0; if (point == points) { for (var i = 0; i < points.length - 1; i++) { val += points.value } return val; }else{ return ""; }}加结果数值的千位分隔符应该加在哪里,试了好几次都不太行