how to radio button checked in jquery code example

Example 1: if radio checked jquery

$('#element').click(function() {
   if($('#radio_button').is(':checked')) { alert("it's checked"); }
});

Example 2: jQuery check a radio button

// jQuery version 1.6 or above use:  
$("#myRadioID").prop("checked", true);
 
//jQuery versions below 1.6 use:
$("#myRadioID").attr('checked', 'checked');

Example 3: click on a radio button using jquery

$('input:radio[name=sex]:nth(0)').attr('checked',true);
or
$('input:radio[name=sex]')[0].checked = true;