在index.php中：
以及
在action.php中：
case 'del':
$id = $_GET['id'];
$sql = "delete from stu where id='$id'";
$rw = mysqli_query($conn,$sql);
if ($rw > 0){
echo "";
}else{
echo "";
}
header('Location: index.php');
break;
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id没传过去吧，&id="+id