使用 jquery 从广播组获取值

I am trying to get value of radio group with name managerelradio. My html code for this radio group is.

 <label><input type="radio" name="managerelradio" value="Yes" id="Add">Add</label>
 <label><input type="radio" name="managerelradio" value="No" id="Remove">Remove</label>

Jquery 是这样的..

    var manageradiorel = $('input[name = "managerelradio"]:checked' , '#managechildform').val();
 alert(manageradiorel);

 var manageradiorel = $('input[name = "managerelradio"]:checked').val();
 alert(manageradiorel);

var manageradiorel = $("input:radio[name ='managerelradio']:checked").val();
alert(manageradiorel);