Vue-Cli 3.0在ie9/ie10下"super"关键字不起效果

Question

//父类
class BaseChart{

constructor(data){
    this.chartData = data.chartData || []; //主要数据源
    this.title = data.title || ""; //标题
    this.xTitle = data.xTitle || ""; //x轴标题
    this.yTitle = data.yTitle || ""; //y轴标题
    this.xUnit = data.xUnit || ""; //x轴单位
    this.yUnit = data.yUnit || ""; //y轴单位
    this.vUnit = data.vUnit || ""; //value单位
    this.chartType = data.chartType || 0;
    this.dataType = data.dataType || 0; //是否需要过滤数据
} 

}

//子类
class PieChart extends BaseChart {

constructor(data){
    super(data);
    this.legenddata = [];
    this.vdata = [];
}

}

父类的属性输出undifined，怎么破？