Some times the normal jquery reference may not work with the sharepoint scripting webpart
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
Google CDN:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
Microsoft CDN:
<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.12.2.min.js"></script>
Try The Below Code To Enable The JQuery Scripting
<script src="http://code.jquery.com/jquery-1.10.2.min.js" type="text/javascript"></script>
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