我需要处理API结果，这样我就不会收到小于0的值，我一直在尝试这种方法，但到目前为止，我还不能：

private handleChart(data: Object): void {
    const series = [];

    for (const [key, value] of Object.entries(data)) {
      series.push({
        name: key,
        data: value,
        type: "line",
      });
    }

    if (series[0].data.length < 0) {
      delete series[0].data;
    }
    console.log(data );  

    this.plotChart(series);
  }

原始代码：

private handleChart(data: Object): void {
    const series = [];

    for (const [key, value] of Object.entries(data)) {
      series.push({
        name: key,
        data: value,
        type: "line",
      });
    }

    this.plotChart(series);
  }