[完善]修改bug

src/app/home/task/station-task-execution/task-details/task-details.component.html

@@ -1,12 +1,12 @@
 <div class="bigbox">
   <div class="btnbox">
     <button class="goback" nz-button nzType="primary" (click)="goback()">返回</button>
-    <button nz-button nzType="primary" (click)="download(1)">下载演练卡</button>
-    <button nz-button nzType="primary" (click)="download(2)">下载数字化预案</button>
+    <button nz-button nzType="primary" (click)="download(1)" *ngIf="tabnum == 1">下载演练卡</button>
+    <button nz-button nzType="primary" (click)="download(2)" *ngIf="tabnum == 2">下载数字化预案</button>
   </div>
 
   <div class="box">
-    <nz-tabset>
+    <nz-tabset [(nzSelectedIndex)]="tabnum">
       <nz-tab nzTitle="“防消联勤”工作检查情况登记表">
         <div id="tablebox3">
           <p style="margin:0pt; orphans:0; text-align:center; widows:0">

src/app/home/task/station-task-execution/task-details/task-details.component.ts

@@ -13,7 +13,7 @@ export class TaskDetailsPagesComponent implements OnInit {
 
   constructor(public methodService: MethodService, private route: ActivatedRoute, private http: HttpClient) { }
 
-
+  tabnum = 0
   /**
    * 实战演练表格信息
    */