- [ ] I have searched the [issues](https://github.com/vueComponent/ant-design-vue/issues) of this repository and believe that this is not a duplicate. ### Version 2.1.4 ### Environment mac、window ### Reproduction link [](https://codesandbox.io/embed/vue-antd-select-bug-example-u1glp?fontsize=14&hidenavigation=1&theme=dark) ### Steps to reproduce 1、把Select组件放在scroll父容器下 2、点开select,然后鼠标上下滚动 3、看到options没有跟随select滚动。 ### What is expected? 在scroll父容器,options没有跟随select滚动。 ### What is actually happening? 没有跟着滚动 <!-- generated by issue-helper. DO NOT REMOVE -->