fix: check HTMLAnchorElement in saveAs for mini-program (#966)

[odex21]

fix #966

[netlify]

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[codecov-commenter]

Codecov Report

Merging #967 (451d9de) into v2 (b0c3d5c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##               v2     #967   +/-   ##
=======================================
  Coverage   99.73%   99.73%           
=======================================
  Files           9        9           
  Lines         382      382           
  Branches       97       97           
=======================================
  Hits          381      381           
  Partials        1        1           

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[posva]

Thanks! Note this file-saver code is removed in production as it's only used during dev