Fix/tree select 0910

[liyuan-meng]

🤔 这个变动的性质是？

• 新功能提交
• 日常 bug 修复
• 站点、文档改进
• 组件样式改进
• 代码风格优化
• 重构
• 其他改动（是关于什么的改动？）

🔗 相关 Issue

• 请在pr创建完成，右侧 linked issue 链接您的issue。

💡 需求背景和解决方案

📝 更新日志怎么写？

☑️ 请求合并前的自查清单

• 文档已补充或无须补充
• 代码演示已提供或无须提供

[codecov]

Codecov Report

Merging #555 (fb0a822) into master (d3696ad) will increase coverage by 0.07%.
The diff coverage is 100.00%.

❗ Current head fb0a822 differs from pull request most recent head a441ea9. Consider uploading reports for the commit a441ea9 to get more accurate results

@@            Coverage Diff             @@
##           master     #555      +/-   ##
==========================================
+ Coverage   84.50%   84.58%   +0.07%     
==========================================
  Files          92       92              
  Lines        4318     4340      +22     
  Branches     1002     1005       +3     
==========================================
+ Hits         3649     3671      +22     
  Misses        536      536              
  Partials      133      133              

Impacted Files	Coverage Δ
src/components/tree-select/const.js	100.00% <100.00%> (ø)
src/components/tree-select/single-tree.js	100.00% <100.00%> (ø)
src/components/tree/index.js	28.42% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d3696ad...a441ea9. Read the comment docs.