[bugfix] Field: cut off charactor input when use maxlength

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #2295 into dev will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##              dev    #2295   +/-   ##
=======================================
  Coverage   86.33%   86.33%           
=======================================
  Files         100      100           
  Lines        1778     1778           
  Branches      364      364           
=======================================
  Hits         1535     1535           
  Misses        185      185           
  Partials       58       58

Impacted Files	Coverage Δ
packages/field/index.vue	100% <100%> (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 ebef4d3...88973a5. Read the comment docs.