[Improvement] Tab: add change event

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #1503 into dev will decrease coverage by 0.16%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##              dev    #1503      +/-   ##
==========================================
- Coverage   84.18%   84.02%   -0.17%     
==========================================
  Files          96       96              
  Lines        1518     1521       +3     
  Branches      304      306       +2     
==========================================
  Hits         1278     1278              
- Misses        217      220       +3     
  Partials       23       23

Impacted Files	Coverage Δ
packages/tabs/index.vue	7.29% <0%> (-0.24%)	⬇️

---

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 9da3e0c...95640fe. Read the comment docs.