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Question

基本上我想检查一个数据库，看看用户名和密码是否匹配，如果匹配则解锁提交按钮。

<?php
mysql_connect('localhost', '', '');
mysql_select_db('database');
if(isset($_POST['submit'])){
    mysql_query("SELECT username,password FROM table WHERE username='".$_POST['username']."',password='".$_POST['password']."'")
}
?>

表格:

<form method="post">
Username <input type="text" name="username" />
Password <input type="password" name="password" />
<input type="submit" name="submit" value="Login" />
</form>

Answer 1

我不知道我是否理解你的意思，但无论如何试试:

HTML:

  <form method="post">
     Username <input type="text" id="username" name="username" />
     Password <input type="password" id="password" name="password" />
    <input type="submit" name="submit" id="submit" value="Login" />
 </form>

jQuery:

    $("#submit").hide();
    $.post("checkUsername.php", { username: $("#username").val(), password: $("#password").val() }, function(result) {
 if(result == "true") { $("#submit").fadeIn(fast); }

 });

PHP(检查用户名.php):

if(mysql_num_rows(mysql_query("SELECT username,password FROM table WHERE username LIKE '". mysql_real_escape_string($_POST['username']) . "',password LIKE '".mysql_real_escape_string($_POST['password'])."'")))
    {
       echo "true";
    }
    else
    {

    echo "false";
    }