<?php

$host = "127.0.0.1";

$userName = "root";

$password = "111";

if($connID = mysqli_connect($host,$userName,$password)){

echo"<script type='text/javascript'>alert('数据库连接成功！');</script>";

}else{

echo"<script type='text/javascript'>alert('数据库连接失败！');</script>";

}

?>

换成你自己的mysql 的用户名和密码。参见视频：https://www.bilibili.com/video/av56127470/?p=139