[bugfix] Area: change event values incorrect

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #3219 into dev will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##              dev    #3219   +/-   ##
=======================================
  Coverage   89.81%   89.81%           
=======================================
  Files         107      107           
  Lines        2228     2228           
  Branches      203      203           
=======================================
  Hits         2001     2001           
  Misses        192      192           
  Partials       35       35

Impacted Files	Coverage Δ
packages/area/index.js	90.47% <100%> (ø)	⬆️

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