修改传感器管理：增加页数选择器

src/app/main/sensor-mgr/sensor-mgr.component.html

@@ -14,6 +14,7 @@
 </div>
 <div class="tableBar" @fade>
   <nz-table #nzTable
+            nzShowSizeChanger
             [nzData]="data"
             [nzLoading]="isLoading"
             [nzFrontPagination]="false"
@@ -21,7 +22,8 @@
             [(nzPageSize)]="rows"
             [nzTotal]="total"
             (nzPageIndexChange)="pageChange()"
-            (nzPageSizeChange)="pageChange()">
+            (nzPageSizeChange)="pageChange()"
+            [nzPageSizeOptions]="[10,20,30,40,50,100]">
     <thead nz-thead>
     <tr>
       <th