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<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script><script src="https://code.jquery.com/jquery-3.5.1.min.js"></script><script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script>
<script type="text/javascript" src="jscript/myExternalJs.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>$.getScript("test.js", function(){
alert("Running test.js");
});
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js">
</script>
</head>