highcharts系列删除功能删除所有原始系列数据(即使存储在新变量中）

每当我在highcharts向下钻取函数中调用series.remove（）时，图表系列都会按预期删除和取消设置。然而，我需要存储原始图表数据，以便"钻取"

我已经将数据保存到另一个变量中，但调用remove也会取消设置我存储在该变量中的数据。我猜它是以某种方式通过引用存储的？

我曾尝试使用jquery函数复制数据，但highchartsseries.remove（）函数仍在擦除数据。

这是我的onclick代码：

function() {
    var drilldown = this.series.options.drilldownSeries;
    if (drilldown) {
        setChart(drilldown[this.category]);
    }
    else {
        setChart('drillUp');
    }
}

这是我的集合图表代码：

window.rhChartDataBank = {};
function setChart(data) {
    if (data !== 'drillUp'){
        //HERE'S WHERE i TRY TO COPY THE DATA TO ANOTHER PLACE
        if (window.rhChartDataBank._originalData === undefined || window.rhChartDataBank._originalCategories === undefined){
            var series0 = jQuery.extend(true, {}, hChart.series[0].data),
            series1 = jQuery.extend(true, {}, hChart.series[1].data);
            window.rhChartDataBank._originalData = [];
            window.rhChartDataBank._originalCategories = [];
            window.rhChartDataBank._originalData.push(series0);
            window.rhChartDataBank._originalData.push(series1);
            window.rhChartDataBank._originalCategories = hChart.series[0].xAxis.categories;
        }
        //Remove current series
        while(hChart.series.length > 0){
            hChart.series[0].remove(false);
        }
        //Set new categories
        var newCategories = [];
        for (var i = 0; i < data.length; i++) {
            newCategories.push(data[i].data.x);
        }
        //Set new data
        var newData = [];
        for (var i = 0; i < data.length; i++) {
            newData.push(data[i].data.y);
        }
        hChart.xAxis[0].setCategories(newCategories, false);
        hChart.addSeries({
            type: 'column',  
            data: newData,
        }, false);
        hChart.redraw();
    }
    else{
        //Remove current series
        while(hChart.series.length > 0){
            hChart.series[0].remove(false);
        }
        //BY THE TIME THIS RUNS window.rhChartDataBank._originalData is full of only null values.
        //Set old categories
        var oldCategories = [];
        for (var i = 0; i < window.rhChartDataBank._originalCategories.length; i++) {
            oldCategories.push(window.rhChartDataBank._originalCategories[i]);
        }
        //Set old data
        var oldData = [];
        for (var i = 0; i < window.rhChartDataBank._originalData[0].length; i++) {
            oldData.push(window.rhChartDataBank._originalData[0][i]['y']);
        }
        hChart.xAxis[0].setCategories(window.rhChartDataBank._originalCategories, false);
        //ADDING IN DUMMY DATA FOR NOW SINCE I CAN'T GET DATA FROM ORIGINAL CHART...
        var ddddata = [45,20,70];
        hChart.addSeries({
            type: 'column',  
            data: ddddata,
        }, false);
        hChart.redraw();
    }
}