<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

​

<-- form input radio -->

<form id="myForm">

  <input type="radio" name="radioName" value="1" /> 1 <br />

  <input type="radio" name="radioName" value="2" /> 2 <br />

  <input type="radio" name="radioName" value="3" /> 3 <br />

</form>

​

<script>

// function onclick

$("input[type='radio'][name='radioName']").click(function() {

    var value = $(this).val();

});

​

// function onchange

$('#myForm input [type="radio"][name="radioName"]').on('change', function() {

   alert($var value = $(this).val()); 

});

// get value by name

  $("input[name='radioName']:checked").val()

// get value if has multiple form and get confuse which one will get

  $('#myForm input[type=radio]:checked').val()

 // another reference

  $("input[type=radio][name='radioName']:checked").val()

</script>

​

​