public Down(path: string) {

    return this.http.get(path, { responseType: "blob" }).subscribe((results) => {

      this.saveExcel(results, "导出数据");

    });

  }

  /**

  * 请求成功之后保存成excel文件（基本导出方法，请求成功之后调用）

  * @param data

  * @param name

  */

  public saveExcel(data: Blob, name: string) {

    var a = document.createElement('a');

    var blob = new Blob([data], { 'type': "application/vnd.ms-excel" });

    a.href = URL.createObjectURL(blob);

    a.download = name + ".csv";

    a.click();

  }