<form action="setduty.php?action=add" method="post" name="setForm" id="setForm">
<p> <label>类型：</label>
  <select name="type" id="typeduty">
  <option value="-1">选择类型</option>
  <option value="1">值班首长</option>
  <option value="2">值班处长</option>
  <option value="3">值班员</option>
  </select>
</p>
<p class="opertext"> 
    <label>成员：</label>
   <textarea name="names" id="names" cols="30" rows="10"></textarea>
</p>

$(document).ready(function(){
 $("#typeduty").change(function(){
  var type = $("#typeduty").val();
  $.post("setduty_do.php",
   {
    'cid' : type,
   },function(data,status){
    newData = data.replace(/\r\n/g,'');
     $("#names").html(newData);
  });
 });
});

if($type){
 switch($type){
  case "1":
   $arrs = getChiefList();
  break;
  case "2":
   $arrs = getDirectList();
  break;
  case "3":
   $arrs = getAttendantList();
  break;
  default:
  break;
 }
 $arr_names = "";
 foreach($arrs as $arr){
  if(strlen($arr[1])>2){
   $arr_names.= $arr[1]."\n";
  }
 }
 echo $arr_names;
}