[代码优化](v2.6)：角色管理选择菜单Bug修复

src/views/system/role/index.vue

@@ -240,9 +240,12 @@ export default {
           }
         } else {
           for (let i = 0; i < childIds.length; i++) {
+            const index = this.menuIds.indexOf(childIds[i])
+            if (index === -1) {
               this.menuIds.push(childIds[i])
             }
           }
+        }
         this.$refs.menu.setCheckedKeys(this.menuIds)
       })
     },