!DOCTYPE html>
html lang="en">
head>
  meta charset="UTF-8">
  title>Title/title>
  style>
    *{
      margin:0px auto;
      padding:0px;
    }
    .l{
      height:50px;
      width:198px;
      border-bottom:1px solid black;
      text-align: center;
      line-height:40px;
      vertical-align: middle;
    }
  /style>
  script src="../wenjian/jquery-2.2.3.min.js">/script>
/head>
body>
div style="height: 50px;width: 200px">input type="text" id="name" style="width: 198px;height: 48px;">/div>
div id="list" style="height: 500px;width: 200px;border: 1px solid black">
!--div id="l">zhongguo/div>-->
/div>

/body>
/html>
script>
$("#name").keyup(function () {
  var n = $("#name").val();
  if (n != ""){
  $.ajax({
    url:'ltchuli.php',
    data:{n:n},
    type:'post',
//    dataType:'text',
    dataType:'json',
    success:function (data) {
//text写法
//     var s = data.split("|");
//     var str = "";
//     for (var i=0;is.length;i++)
//     {
//       str = str + "div class='l'>" +s[i] +"/div>";
//     }
//     $("#list").html(str);
//json写法

      for (var i in data){
        $("#list").append("div class='l'>" +data[i] +"/div>");
      }
    }
  });
}else {
    $("#list").html("");
  }
})
/script>

?php
/**
 * Created by fcc
 * User: Administrator
 * Date: 2017/10/30
 * Time: 9:52
 */
$n = $_POST['n'];
require_once "../wenjian/DBDA.class.php";
$db = new DBDA();
$obj = "select region_name from region WHERE region_name LIKE '%{$n}%' ";
$data = $db->Query($obj);
//echo $data;
echo json_encode($data);