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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("button").click(function(){
    alert($("input:text").val());
  });
});
</script>
</head>
<body>
Firstname: <input type="text" name="fname" value="Peter"><br>
Lastname: <input type="text" name="lname" value="Griffin"><br><br>
<button>Return the value of the first input field</button>
</body>
</html>