Most easy way to get radio button value with Javascript

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<label for="gender">Gender: </label> <input type="radio" name="genderS" value="1" checked="checked"/>Male <input type="radio" name="genderS" value="2" />Female <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.querySelector('input[name="genderS"]:checked').value; document.getElementById("demo").innerHTML = x; } </script>