$.get发送GET请求，并接收返回结果集，主页面INDEX.PHP

<script>
$(function(){
 //function ajax(){
  $.get("comment.php?id=1",function(data){
   $("div").html(data);
  })
  //};
})
</script>

<DIV></DIV>

comment.php页 

<?php header("Content-type: text/html; charset=gb2312");

//$mypdo=new pdo("mysql:host=localhost;dbname=news","root","");
$mypdo=new pdo("mysql:host=localhost;dbname=news;","root","");
$mypdo->query("set names gb2312");

$id=$_GET['id'];
$sql="selects id,title from news where id=$id limit 0,20";
$stmt=$mypdo->query($sql);

$rows=$stmt->fetchAll();

foreach($rows as $rs){
 echo $rs['title']."<br>";
}
?>