fix(example): add event extract

[zhuzhongshu123]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (master@0c04799). Click here to learn what that means.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #72   +/-   ##
=========================================
  Coverage          ?   52.12%           
  Complexity        ?      240           
=========================================
  Files             ?      626           
  Lines             ?    19591           
  Branches          ?     3105           
=========================================
  Hits              ?    10211           
  Misses            ?     8195           
  Partials          ?     1185           

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