<apex:includescript> tag, will the script be included twice?
If you use the same
Best to load your libraries using
<apex:includeScript> and then perform any component-specific invocations inside
If I remember correctly this is the only reason why you would use
Otherwise you would just use
<script> at the bottom of the page (this way your page will load faster)
Edit: For the person that downvoted me, this behaviour is actually described in the documentation: apex:includeScript
<apex:page>tag, rather than this component.