修复菜单折叠时，打开菜单子项弹出问题

src/components/menu/menu.js

@@ -42,6 +42,11 @@ export default {
       type: String,
       required: false,
       default: 'inline'
+    },
+    collapsed: {
+      type: Boolean,
+      required: false,
+      default: false
     }
   },
   data () {
@@ -50,6 +55,13 @@ export default {
       openKeys: []
     }
   },
+  watch: {
+    collapsed (val) {
+      if (val) {
+        this.openKeys = []
+      }
+    }
+  },
   methods: {
     renderIcon: function (h, icon) {
       return icon === 'none' ? null