Uncaught ReferenceError: $ is not defined at main.js: code example

Example 1: Uncaught ReferenceError: $ is not defined

<script src="https://code.jquery.com/jquery-1.9.1.js"></script>
<script src="path-para-seu-script"></script>

Example 2: register:48 Uncaught ReferenceError: $ is not defined

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>