动态添加多个系列的Highcharts上的工具提示问题

var chart = Highcharts.chart('container', {
    // 图表配置选项
});

var seriesData = [];

for (var i = 0; i < seriesCount; i++) {
    var series = {
        name: 'Series ' + (i + 1),
        data: seriesData[i] // 系列数据
    };
    seriesData.push(series);
}

var chart = Highcharts.chart('container', {
    series: seriesData
});

var series = {
    name: 'Series 1',
    data: seriesData,
    tooltip: {
        // 工具提示配置选项
    }
};

var series = {
    name: 'Series 1',
    data: seriesData,
    tooltip: {
        formatter: function() {
            return 'Series: ' + this.series.name + '<br>' +
                   'Value: ' + this.y;
        }
    }
};