尝试以高角度实现HTTP缓存清除

Question

我对angular还是陌生的，需要执行一项任务。

任务是从quandl api获取数据并 缓存 ..... ????。在高图散点图上以及单击清除缓存按钮时显示它。清除缓存。

上次我只使用了简单的http调用：

  getData(url= 'https://www.quandl.com/api/v3/datasets/WIKI/AAPL.json?api_key=ifgfg,fg'){
  this.http.get(url).subscribe(data => {
    this.dataAll = data;
    this.dataArray = this.dataAll.dataset.data;
    this.currentDate = new Date().toString();
    this.currentDate = new Date(this.currentDate).toUTCString();
    this.currentDate = this.currentDate.split(' ').slice(0, 5).join(' ');
    this.dataArray.forEach((da) => da.forEach((element, index) => {if ( index === 0){da[index] = new Date(element).getTime() ; }  }));
    this.newDataArr = this.dataArray.reverse();
    Highstock.stockChart('container', {
      rangeSelector: {
        selected: 3,
        allButtonsEnabled: true,
        buttons: [{
            type: 'week',
            count: 1,
            text: 'Week',
            dataGrouping: {
                forced: true,
                units: [['day', [1]]]
            }
        }, {
            type: 'month',
            count: 1,
            text: 'month',
            dataGrouping: {
                forced: true,
                units: [['week', [1]]]
            }
        }, {
          type: 'month',
          count: 3,
          text: '3 months',
          dataGrouping: {
              forced: true,
              units: [['week', [1]]]
          }
      }, {
        type: 'month',
        count: 6,
        text: '6 months',
        dataGrouping: {
            forced: true,
            units: [['week', [1]]]
        }
    },  {
      type: 'year',
      count: 3,
      text: 'year',
      dataGrouping: {
          forced: true,
          units: [['week', [1]]]
      }
  }, {
            type: 'all',
            text: 'All',
            dataGrouping: {
                forced: true,
                units: [['month', [1]]]
            }
        }],
        buttonTheme: {
            width: 60
        },
    },
      title: {
        text: this.currentTicker + ' Last queried on: ' + this.currentDate
      },
      series: [{
          type: 'ohlc',
          name: this.currentTicker + ' Stock Price',
          data: this.newDataArr,
          dataGrouping: {
              units: [[
                  'week', // unit name
                  [1] // allowed multiples
              ], [
                  'month',
                  [1, 2, 3, 4, 6]
              ]]
          }
      }]
  });
});

我对清除此处的缓存不感到困惑。谁能在清除缓存部分上帮我...。这可能意味着什么？