CN-671 Dashboard - 多维度表格优化：更改tab时，不重新请求接口；显示更多按钮在点击后消失功能实现；

src/assets/css/components/views/charts2/networkOverviewTabs.scss

@@ -18,6 +18,20 @@
           cursor: pointer;
         }
       }
+      .tab-table__average {
+        border: 1px solid #E2E5EC;
+        border-radius: 4px 4px 0 0;
+        padding: 1px;
+        .data-click:hover{
+          cursor: pointer;
+        }
+        .el-table__body {
+          height:100%;
+        }
+      }
+      .tab-table__no-bottom {
+        border-radius: 4px !important;
+      }
       .data-total{
         display: flex !important;
         justify-content:center;
@@ -101,7 +115,7 @@
       height: calc(100% - 40px);
       border:none;
       .el-table__body-wrapper {
-        height: calc(100% - 34px) !important;
+        height: calc(100% - 30px) !important;
       }
     }
   }
@@ -289,13 +303,11 @@
   justify-content: flex-start;
   align-items: center;
   background: white;
-  margin-top: 2px;
   width: 100%;
   height:40px;
   border:solid 1px #E2E5EC;
   padding-left:10px !important;
   text-align: left;
-  border-top:0px;
   border-radius:0 0 4px 4px;
   color:#046eca;
   .fixed-button {