[bugfix] Tabbar: change event

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #1571 into dev will decrease coverage by 0.05%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##              dev    #1571      +/-   ##
==========================================
- Coverage   83.68%   83.62%   -0.06%     
==========================================
  Files          96       96              
  Lines        1520     1521       +1     
  Branches      307      308       +1     
==========================================
  Hits         1272     1272              
- Misses        225      226       +1     
  Partials       23       23

Impacted Files	Coverage Δ
packages/tabbar/index.vue	63.63% <0%> (-6.37%)	⬇️

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