value为0时，如何让datalabel不显示0

[a123478we]

dataLabels.formatter = @AAJSFunc(function (){

            let length = this.points.length;
            for (let i = 0; i < length; i++) {
                let thisPoint = this.points[i];
                let yValue = thisPoint.y;
                if (yValue != 0) {
                    return  yValue;
                }
            }
            
        });

但是0 还是显示了

[a123478we]

AAOptions *options = [aaChartModel aa_toAAOptions]; options.plotOptions.series.events = @{@"legendItemClick":@"false"}; AADataLabels *dataLabels = options.plotOptions.column.dataLabels; dataLabels.verticalAlign = @"top"; dataLabels.y = @-20; dataLabels.allowOverlap = true; dataLabels.crop = false; dataLabels.overflow = @"none"; dataLabels.formatter = @AAJSFunc(function (){

            let length = this.points.length;
            for (let i = 0; i < length; i++) {
                let thisPoint = this.points[i];
                let yValue = thisPoint.y;
                if (yValue != 0) {
                    return  yValue;
                }
            }
            
        });