doExport(){ this.exprotLoading = true; let params = {} this.preChangeRankService .getPreInvestRankingExport(params).subscribe(res=>{ this.downloadService.download(res, '预投入转化排名'); this.exprotLoading = false; }) }

这段代码是一个Angular组件中的一个方法，它通过调用preChangeRankService服务的getPreInvestRankingExport方法来获取数据，并通过downloadService服务下载数据。在下载数据之前，将exprotLoading设置为true，下载完成后将其设置为false。

相关问题

如何在以下代码中加入分页的功能 后端代码：@Query( "select approvalRecord from ApprovalRecord approvalRecord inner join ApprovalRecordItem approvalRecordItem on approvalRecord = approvalRecordItem.approvalRecord where approvalRecordItem.status <> 'AUDITING' and approvalRecordItem.createdBy.login = ?#{principal.username} order by approvalRecordItem.id desc" ) List<ApprovalRecord> findAuditedByCurrentUser(); @GetMapping("/approval-records/my-created") public List<ApprovalRecord> getAllCreatedApprovalRecords() { log.debug("REST request to get all getAllCreatedApprovalRecords"); return approvalRecordRepository.findByCreatedByIsCurrentUser(); } 前段代码： queryAuditing(req?: any): Observable<EntityArrayResponseType> { const options = createRequestOption(req); return this.http .get<IApprovalRecord[]>(`${this.resourceUrl}/my-auditing`, { params: options, observe: 'response' }) .pipe(map((res: EntityArrayResponseType) => this.convertDateArrayFromServer(res))); } loadAll(): void { this.approvalRecordService.queryAuditing().subscribe((res: HttpResponse<IApprovalRecord[]>) => { this.auditingApprovalRecords = res.body ?? []; });

您可以在后端代码中添加分页参数，如下所示：

@Query("select approvalRecord from ApprovalRecord approvalRecord inner join ApprovalRecordItem approvalRecordItem on approvalRecord = approvalRecordItem.approvalRecord where approvalRecordItem.status <> 'AUDITING' and approvalRecordItem.createdBy.login = ?#{principal.username} order by approvalRecordItem.id desc")
List<ApprovalRecord> findAuditedByCurrentUser(Pageable pageable);

然后，在前端代码中将分页参数传递到后端，如下所示：

queryAuditing(req?: any): Observable<EntityArrayResponseType> {
  const options = createRequestOption(req);
  return this.http.get<IApprovalRecord[]>(`${this.resourceUrl}/my-auditing`, { params: options, observe: 'response' })
    .pipe(map((res: EntityArrayResponseType) => this.convertDateArrayFromServer(res)));
}

loadAll(page: number): void {
  this.approvalRecordService.queryAuditing({ page }).subscribe((res: HttpResponse<IApprovalRecord[]>) => {
    this.auditingApprovalRecords = res.body ?? [];
  });
}

这样，您就可以在前端代码中通过传递 `page` 参数来进行分页了。