radio 선택된 value 값 가져오기

 
<span>
     <input type="radio" name="access" id="a1"  value="Y"/>
     <label for="a1" class="mr v-m">예</label>
</span>
<span>
     <input type="radio" name="access" id="a2" value="N" />
     <label for="a2" class="mr v-m">아니오</label>
</span>
 
<h2 class="title3">개인정보 수집 및 이용에 대한 안내</h2>
<section class="joinbox_inner">
     <h1>제1조(목적)</h1>
</section>
<div class="join_inp">
     <span>이용약관에 동의합니다.</span>
     <span>
          <input type="radio" name="pri" id="a3" value="Y"/>
          <label for="a3" class="mr v-m">예</label>
     </span>
     <span>
          <input type="radio" name="pri" id="a4" value="N"  />
          <label for="a4" class="mr v-m">아니오</label>
     </span>
</div>