判断为空的if后面的内容应该放到else里面，否则还是会插入空数据行

<?php

require_once('../connect.php');

//把传递过来的信息入库,在入库之前对所有的信息进行校验。

if(!(isset($_POST['title'])&&(!empty($_POST['title'])))){

echo "<script>alert('标题不能为空');window.location.href='article.add.php';</script>";

}else{

$title = $_POST['title'];

$author = $_POST['author'];

$description = $_POST['description'];

$content = $_POST['content'];

$dateline =  time();

$insertsql = "insert into article(title, author, description, content, dateline) values('$title', '$author', '$description', '$content', $dateline)";

if(mysql_query($insertsql)){

echo "<script>alert('发布文章成功');window.location.href='article.manage.php';</script>";

}else{

echo "<script>alert('发布失败');window.location.href='article.manage.php';</script>";

}

}

?>