Highcharts-ng 設置spline的legend symbol 樣式爲正方形

假如設置的 頁面中的配置是

<highchart config='chartConfigLine' id='chart' style='margin-bottom:50px'></highchart>

js中

$scope.chartConfigLine.func = function(chart) {
            Highcharts.seriesTypes.spline.prototype.drawLegendSymbol =
                Highcharts.seriesTypes.column.prototype.drawLegendSymbol;
        }

便可