fix onChange error when total is string

[cwjTerrace]

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[afc163]

来个 test case 吧。

[codecov]

Codecov Report

Merging #357 (f2521e1) into master (b5fe328) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #357      +/-   ##
==========================================
+ Coverage   92.55%   92.64%   +0.08%     
==========================================
  Files           3        3              
  Lines         336      340       +4     
  Branches      116      119       +3     
==========================================
+ Hits          311      315       +4     
  Misses         25       25              

Impacted Files	Coverage Δ
src/Pagination.jsx	91.38% <100.00%> (+0.13%)	⬆️

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