Javascript HighCharts从数据列表中获取额外值

Question

我有以下代码

   var onload = function () {

        var mainData = [data1];
        var cList=[];

        for (var i = 0; i < mainData[0].cars.length; i++) {

            var obj = mainData[0].cars[i];

            var chlst = obj.name; //THIS ONE GETS THE NAME VALUE  ... I ALSO WANT THE ID

            cList.push(chlst);

        }


        jQuery('#container').highcharts({

            chart: {
                type: 'column'
            },
            title: {
                text: ''
            },
            xAxis: {
                categories: cList,
                labels: {
                    rotation: -45,
                    style: {
                        fontSize: '10px'
                    }
                }
            },
            yAxis: {
                min: 0,
                title: {
                    enabled: true,
                    text: '',
                },
                stackLabels: {
                    enabled: true,
                    style: {
                        fontWeight: 'bold',
                        color: (Highcharts.theme && Highcharts.theme.textColor) || 'gray'
                    }
                }
            },
            legend: {
                align: 'right',
                x: -30,
                verticalAlign: 'top',
                y: 25,
                floating: true,
                backgroundColor: (Highcharts.theme && Highcharts.theme.background2) || 'white',
                borderColor: '#ccc',
                borderWidth: 1,
                shadow: false
            },
            tooltip: {
                formatter: function () {
                    return '<b>' + this.x + '</b><br/>' +
                            this.series.name + ': ' + this.y;
                }
            },
            plotOptions: {
                series: {
                    cursor: 'pointer',
                    point: {
                        events: {
                            click: function () {


                                alert(this.category);

                            },
                        },
                    },
                },
                column: {
                    stacking: 'normal',
                    dataLabels: {
                        enabled: true,
                        color: (Highcharts.theme && Highcharts.theme.dataLabelsColor) || 'white',
                        style: {
                            textShadow: '0 0 3px black'
                        }
                    }
                }
            },
            series: [{
                name: 'other',
                data: o1 //ignore this part
            }, {
                name: 'other2',
                data: o2 //ignore this part
            }]
        });

在Click事件中，当我添加它时：

alert(this.category); //Returns the Name ...But I also need the Id

它会给我cList中点击栏的值，这很好但是这给了我名字值（这是旧的添加到cLIst），但我还需要获取id而不显示它在图表中。

我该怎么做？