eg:

<div class="form-group">
     <label class="col-sm-2 control-label">是否输出</label>
     <div class="col-sm-4">
         <label class="radio-inline">
             <input type="radio" name="need_dunning" value="2" class="shouchu_radio" checked>
             否
         </label>
         <label class="radio-inline">
             <input type="radio" name="need_dunning" value="1" class="shouchu_radio">
             是
         </label>
     </div>
 </div>
 <div class="form-group cuishou" >
     <label class="col-sm-2 control-label">APIKEY</label>
         <div class="col-sm-4">
             <input type="text" class="form-control" name="service_key" value="">
         </div>
 </div>
 <div class="form-group cuishou" >
     <label class="col-sm-2 control-label">PASSWORD</label>
     <div class="col-sm-4">
         <input type="text" name="service_secret" class="form-control" value="">
     </div>
 </div>

radio 触发机制

$("input:radio.shouchu_radio").on('change', function(event) {
         if ('1' == $(this).val()) {
             $("div.cuishou").css({
                 display: 'block'
             });
         } else {
             $("div.cuishou").css({
                 display: 'none'
             });
         }
     });