How to get value radio button

tanpa basa basi sikat langsung code nya
copy => paste => done

---

<form id="formtest">

<div id="output"></div>

</form> <script> // untuk looping radio nya

var html_loop = "";

var jum = 4;

var i=0;

for(i; i < jum; i++){

    html_loop += '<input type="radio" name="tester" value="'+i+'">'+i;

}

$("#output").html(html_loop);

// get value nya

$('#formtest input[type=radio]').change(function (e) {

var eval = $('input[name="tester"]:checked', '#formtest').val()

alert(eval);

}); </script>