style: 统一部分下拉列表样式

src/views/charts2/charts/networkOverview/NetworkOverviewApps.vue

@@ -7,7 +7,7 @@
             size="mini"
             v-model="metricFilter"
             placeholder=""
-            popper-class="app-metric"
+            popper-class="common-select"
             :popper-append-to-body="false"
             @change="metricChange"
         >

src/views/charts2/charts/networkOverview/NetworkOverviewLine.vue

@@ -34,7 +34,8 @@
               <el-select
                   size="mini"
                   v-model="value1"
-                  popper-class="metric"
+                  popper-class="common-select"
+                  :popper-append-to-body="false"
                   @change="metricSelectChange"
               >
                 <el-option v-for="item in options1" :key="item.value" :label="item.label" :value="item.value"></el-option>
@@ -48,7 +49,8 @@
                   size="mini"
                   v-model="value2"
                   :disabled="!activeShow"
-                  popper-class="reference-line"
+                  popper-class="common-select"
+                  :popper-append-to-body="false"
                   @change="referenceSelectChange"
               >
                 <el-option v-for="item in options2" :key="item.value" :label="item.label" :value="item.value"></el-option>

src/views/charts2/charts/networkOverview/NetworkOverviewTabs.vue

@@ -70,7 +70,7 @@
         <span>{{$t('network.metric')}}:</span>
         <el-select v-model="metric"
                    class="option__select select-column"
-                   popper-class="option-popper metric-select"
+                   popper-class="option-popper common-select"
                    :popper-append-to-body="false"
                    key="tabMetric"
                    @change="changeMetric"