Test if jQuery is loaded

<!DOCTYPE html>

<html>

<head>

<script

src="https://code.jquery.com/jquery-3.5.1.slim.min.js"

integrity="sha256-4+XzXVhsDmqanXGHaHvgh1gMQKX40OUvDEBTu8JcmNs="

crossorigin="anonymous"></script>

</head>

<body>

<button>click</button><br><br>

$("button").click(function(){

$("label").text("hello");

})

</script>

</body>

</html>

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