Angular 6 CSV下载

Question

我是angular的新手，目前我正在一个需要csv导出的项目中工作。在这里，我使用Angular 6作为前端，使用laravel作为后端这就是我使用mattwebsite / excel编写laravel函数的方式// Lead export to csvpublic function downloadExcel(Request $request){    $credentials = $request->only('token');    $token = $credentials['token'];    $userid = $this->getUseridFromToken($token);    $type = "xls";    $data = DB::table('user_mailbox AS A')                    ->select('A.id', 'A.name', 'A.email', 'A.phone', DB::raw('DATE_FORMAT(A.send_on, "%d / %b / %Y") as send_on'), 'B.listing_heading','B.listing_id','B.listing_heading', 'C.name')                    ->leftjoin('broker_listing AS B', 'B.listing_id', '=', 'A.listing_id')                    ->leftjoin('users AS C', 'C.id', '=', 'A.sent_by')                    ->where('A.sent_to', $userid)                    ->where('A.user_type', '1')                    ->orderBy('A.id', 'desc')->get()->toArray();     Excel::create('Lead_Export', function($excel) use ($data) {        $excel->sheet('Lead_Export', function($sheet) use ($data)        {            $sheet->fromArray($data);        });    })->download($type);}这就是我在角度组件中编写函数的方式    // Download leads as exceldownload_excel(){  const fd = new FormData();   fd.append('token',this.token);  this.brokerleads.downloadLeads(fd).subscribe(    data => this.handleResponsedwnload(data),    error => this.handleErrordwnload(error)  );}handleResponsedwnload(data){ console.log('test');  const blob = new Blob([data], { type: 'text/xls' });  const url= window.URL.createObjectURL(blob);  window.open(url);}handleErrordwnload(data){}服务就是这样  // Download as excel  downloadLeads(data):Observable<any>{    return this.http.post(`${this.baseUrl}downloadExcel`, data);     }看法    <a class="export-leads" href="javascript:void(0);" (click)="download_excel()" >EXPORT LEADS</a>在执行此操作时，我收到这样的响应，但文件未下载