datePicker的mode为'year'时，选中年份，下拉框不会消失 #10425
Description
- I have searched the issues of this repository and believe that this is not a duplicate.
Version
3.4.4
Environment
chrome
Reproduction link
https://codepen.io/anon/pen/gzowME?editors=0010
Steps to reproduce
https://codepen.io/anon/pen/gzowME?editors=0010
What is expected?
选择年份后下拉框关闭
What is actually happening?
选择年份后下拉框未关闭