Session: In computers, especially in network applications, it is called "session control". Session object stores the properties and configuration information required for a specific user session.
Login form processing (Recommended learning: PHP video tutorial)
alert("登录成功");window.location.href="file.php";
alert("对不起，您输入的用户名或密码不正确，请重新输入!");window.location.href="index.php";
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