<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>test</title>
<script type="text/javascript" src="http://lib.sinaapp.com/js/jquery/1.9.1/jquery-1.9.1.js"></script>
</head>
<body>
<input type="radio" name="op" id=""/> <label for="">111</label>
<input type="radio" name="op" id=""/> <label for="">222</label>
<input type="radio" name="op" id=""/> <label for="">333</label>
<script>
$('input[type="radio"]').click(function(){
if($(this).prop('checked')){
$(this).next().css('color','red');
}
})
</script>
</body>
</html>
$(this).next().css('color','red');
}else { $(this).next().css('color','#000');}