PHP和Ajax并不总是返回响应

Question

I am new in web programming. 我是网络编程新手。 currently I've been trying to make a login/register website. 目前，我一直在尝试建立一个登录/注册网站。 here is my HTML code: 这是我的HTML代码：

<!DOCTYPE html>
<html>
<head>
<link href="test.css" type = "text/CSS" rel = "stylesheet" >
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script type="text/javascript" src="scrpt.js"></script>
</head>
<body>
<form>
    <label> First Name: </label>
    <br>
    <input class = "inp" type = "text" name = "fname" id = "fname"> </input>
    <br>
    <label> Last Name: </label>
    <br>
    <input class = "inp"  type = "text" name = "lname" id = "lname"> </input>
    <br>
    <label> Email: </label>
    <br>
    <input class = "inp"  type = "text" name = "email" id = "email">     </input>
    <br>
    <label> Username: </label>
    <br>
    <input  class = "inp" type = "text" name = "usrname" id = "usr">     </input>
    <br>
    <label> Password: </label>
    <br>
    <input  class = "inp" type = "password" name = "psw" id = "psw"> </input>
    <br>
    <input type = "submit" id = "submit" >  </input>
    <br>
    <label> Login: </label>
    <br>
    <input class = "inp" type = "text" name = "login" id = "log"> </input>
    <br>
    <label> Password: </label>
    <br>
    <input  class = "inp" type = "password" name = "logPsw" id = "logPsw"> </input>
    <br>
    <input type = "submit" id = "logSub" >  </input>
</form>

</body>
</html>

here is my JavaScript code: 这是我的JavaScript代码：

$(document).ready(function(){
$("#submit").click(function(){
    var fn = $("#fname").val();
    var ln = $("#lname").val();
    var email = $("#email").val();
    var usr = $("#usr").val();
    var psw = $("#psw").val();
    $.ajax(
    {
    type: "POST",
    url: "register.php", 
    data: {
        fname: fn,
        lname: ln,
        email: email,
        usr: usr,
        psw: psw
    },
    success: function(result){

    }
    }
    );
});

$('#logSub').click(function(){
    var login = $("#log").val();
    var psw = $("#logPsw").val();
    $.ajax(
    {
        type: "POST",
        url: "login.php",
        data: {
            login: login,
            password: psw
        },
        success: function(result){
            alert(""+result);
        }

    }
    );
});
});

and here is my PHP code: 这是我的PHP代码：

<?php

$servername = "localhost";
$username = "root";
$password = "";
$dbname = "admin_db";

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}



$login = $_POST['login'];
$psw = $_POST['password'];


$sql = "select * from user where userName = \"$login\" and password = \"$psw\"";

$result = $conn->query($sql);

if ($result->num_rows > 0) {
    echo "Yes";
}
else{
    echo "No Such Account";
}
$conn->close();

?>

The problem here is that if I enter an incorrect login/password, it should alert "No Such Account", but 1 out of 5 attempts it doesn't. 这里的问题是，如果我输入了错误的登录名/密码，它应该警告“ No Such Account”，但五分之一的尝试却没有。 First it does, second it does and after third attempt it just doesn't say anything and then after fourth attempt it continues to work fine. 首先是，然后是，在第三次尝试后什么都没说，然后在第四次尝试后仍然可以正常工作。 Can you give me the reason? 你能给我原因吗？

PS I tried to surf every post here and on other forums but none of them seem helpful so if this post is a duplicate please just tell me and I will delete it. PS：我试图在这里和其他论坛上浏览每个帖子，但是它们似乎都没有帮助，因此，如果该帖子重复，请告诉我，我将其删除。

Answer 1

出现此问题的主要原因是，由于没有设置要设置的特定操作和方法，因此它会自动以“ GET”方法提交，因此有时它的提交速度要比ajax快。

PHP和Ajax并不总是返回响应

问题描述

1 个解决方案

解决方案1
0 已采纳 2017-03-19 19:04:40

PHP和Ajax并不总是返回响应

问题描述

1 个解决方案

解决方案1 0 已采纳 2017-03-19 19:04:40

解决方案1
0 已采纳 2017-03-19 19:04:40