fix：处理 下拉框无法收回的问题 以及 alertRule 校验规则的添加

nezha-fronted/src/components/charts/chart-bar-statistics.vue

@@ -21,6 +21,7 @@
             </span>
           </el-popover>
           <el-dropdown trigger="click" class="nz-chart-top" :key="'chartDropdown'+chartIndex"  v-clickoutside="clickos" :class="{'move-able':!isLock}">
+            <el-dropdown-menu style="display: none"></el-dropdown-menu>
             <span class="el-dropdown-link chart-title">
               <span class="chart-title-text">{{chartData.name}}</span>
               <span class="chart-title-icon"  v-if="from !== 'chartTemp'"  :class="{'visible':caretShow,'hidden':!caretShow}">