fix:[menu]: some bug in only has one showing child

src/views/layout/components/Sidebar/SidebarItem.vue

@@ -2,7 +2,7 @@
   <div class="menu-wrapper">
     <template v-for="item in routes" v-if="!item.hidden&&item.children">
 
-      <router-link v-if="item.children.length===1 && !item.children[0].children && !item.alwaysShow" :to="item.path+'/'+item.children[0].path"
+      <router-link v-if="hasOneShowingChildren(item.children) && !item.children[0].children&&!item.alwaysShow" :to="item.path+'/'+item.children[0].path"
         :key="item.children[0].name">
         <el-menu-item :index="item.path+'/'+item.children[0].path" :class="{'submenu-title-noDropdown':!isNest}">
           <svg-icon v-if="item.children[0].meta&&item.children[0].meta.icon" :icon-class="item.children[0].meta.icon"></svg-icon>
@@ -43,6 +43,17 @@ export default {
       type: Boolean,
       default: false
     }
+  },
+  methods: {
+    hasOneShowingChildren(children) {
+      const showingChildren = children.filter(item => {
+        return !item.hidden
+      })
+      if (showingChildren.length === 1) {
+        return true
+      }
+      return false
+    }
   }
 }
 </script>