javascript - Dollar Sign is not declared -


this question has answer here:

https://studio.code.org/projects/applab/sl7lkbrbxvqbhrgbf54wrq/

my project generating random sentences. how make here, program picks random sentence index, , displays on screen? please help.

it says '$ not declared'.

eddie

my coding picture.

all need include jquery in html file so: 

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script

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