PHP批量删除jQuery操作

<?php  header('content-type:text/html;charset=utf-8'); $pdo=new PDO('mysql:host=localhost;dbname=***;','root','root'); $pdo->exec('set names utf8'); $sql='select * from ***'; $info=$pdo->query($sql)->fetchAll(PDO::FETCH_ASSOC);?><center><table border="1"> <tr>  <td>id</td>  <td>title</td>  <td>content</td> </tr> <?php foreach($info as $k => $v){ ?> <tr>  <td><input type="checkbox" name="box" value="<?= $v['id'] ?>"><?= $v['id'] ?></td>  <td><?= $v['title'] ?></td>  <td><?= $v['content'] ?></td> </tr> <?php } ?></table> <button>批量删除</button></center><script src="../jquery.1.12.min.js"></script><script> $(function(){  $('button').click(function(){   var ids=$(':checkbox');   var str='';   var count=0;   for(var i=0;i<ids.length;i++){    if(ids.eq(i).is(':checked')){     str+=','+ids.eq(i).val();     count++;    }   }   var str=str.substr(1);   if(confirm('你确定要删除这'+count+'条数据吗？')){    //获取id后删除    $.ajax({     type:'get',     url:'adminDel.php',     data:{str:str},     success:function(res){      if(res>0){       alert('删除成功');       for(var i=ids.length-1;i>=0;i--){        if(ids.eq(i).is(':checked')){         ids.eq(i).parent().parent().remove();        }       }      }     }    })   }   return false;   /*var box=document.getElementsByName('box');   var str="";   for(var i=0;i<box.length;i++){    if(box[i].checked==true){     str+=','+box[i].value;    }   }   var str=str.substr(1);   alert(str);*/  }); })</script>

<?php  header('content-type:text/html;charset=utf-8'); $str=$_GET['str']; $pdo=new PDO('mysql:host=localhost;dbname=***;','root','root'); $pdo->exec('set names utf8'); $sql='delete from *** where id in ('.$str.')'; $res=$pdo->exec($sql); //受影响行数 echo $res;?>