Php Vuejs Ajax调用自动触发错误函数

大家好，我正在尝试制作一个vueapp，用于对php页面进行ajax调用。在php页面上，我运行了几个mysql语句，其中最重要的是insert语句。如果页面ajax调用成功并且insert语句成功运行，我想重定向页面。如果ajax调用或insert语句失败，或者用户存在，我想将它们重定向到同一个页面，只需根据结果不同地呈现页面。我曾经尝试过使用sessions，但是当我尝试使用ajax错误函数时，它每次都会触发，即使它成功了。我知道这一点，因为我得到了一个警报错误。但是当它转到result.php页面时，我获得了成功。我不明白。任何帮助都会很好以下是vueapp（signup.php）的代码

用户名*

密码*

确认密码*

名字*

姓*

电子邮件*

var app=新的Vue({
el:“#报名表”，
数据：{
用户名：“”，
密码：“”，
确认密码：“”，
名字：''，
姓氏：“”，
电子邮件：“”
},
计算：{
密码匹配：函数（）{
if（this.password==this.confirmPassword）{
返回true；
}否则{
返回false；
}
},
passwordRequirementsMet:function（）{
如果（this.password.length>=8）{
返回true；
}否则{
返回false；
}
},
validEmail:function（）{
变量reg=/^（[A-Za-z0-9\-\.]）+\@（[A-Za-z0-9\-\.]）+\.（[A-Za-z]{2,4}）$/；
如果（！注册测试（此电子邮件））{
返回false；
}
返回true；
}
},
已创建：函数（）{
},
观察：{
},
方法：{
makeAccount:function（）{
if（this.userName.length>=8&&this.firstName！=''&&this.lastName！=''&&this.validEmail&&this.passwordRequirementsMet&&this.passwordsMatch）{
var jsonString=JSON.stringify({
用户名：this.userName，
名字：这个，名字，
lastName:this.lastName，
密码：this.password，
电子邮件：this.email
});
$.ajax({
url:'makeAccount.php'，
数据类型：“json”，
键入：“post”，
contentType:'应用程序/json'，
数据类型：“json”，
资料来源：jsonString，
错误：函数（）{
警报（“错误”）；
window.location.href='result.php'；
},
成功：功能（数据）{
控制台日志（数据）；
警惕（“成功”）；
window.location.href='result.php'；
}.绑定（此）
});
}
}
}
});
?>

下面是php页面的代码，我正在向该页面发出ajax请求。（makeAccount.php）

下面是result.php的代码

<?php session_start();
if(isset($_SESSION['hitpage'])){$ajaxworked=1;} else{$ajaxworked=0;}
if(isset($_SESSION['inserted'])){$inserted=1;} else {$inserted=0;}
if(isset($_SESSION['userexists'])){$userexists=1;} else{$userexists=0;}
if($inserted==1 and $ajaxworked==1){echo 'Congrats you seccessfully created your account click <a href="index.php">here</a> to go home';}
if($ajaxworked==0){echo 'Possible time out if error prosists please contact creative group click <a href="signuptest.php">here</a> to try again';}
if($inserted==0 and $ajaxworked==1 and $userexists==0){echo 'There was an error creating your account if error prosists please contact the creative group click <a href="signuptest.php">here</a> to try again';}
if($userexists==1){echo 'Sorry that user already exists click <a href="signuptest.php">here</a> to try again';}
session_destroy();
?>

---

我流了很多泪，头撞在屏幕上。向太阳底下的每一位上帝祈祷，并进行大量的咒骂，我终于找到了问题所在。我的JSON字符串无效

 <?php session_start();
$_SESSION['hitpage']=1;
require_once('database.php');
  require_once('functions.php');  
  $requestBody = file_get_contents('php://input');
  $requestJSON = json_decode($requestBody);

  require_once 'lib/Braintree.php';

  $gateway = new Braintree_Gateway([
    'environment' => 'sandbox',
    'merchantId' => '*****',
    'publicKey' => '*****',
    'privateKey' => '*****'
  ]);

  $braintreeResponse = $gateway->customer()->create([
    'firstName' => $requestJSON->firstName,
    'lastName' => $requestJSON->lastName,
    'email' => $requestJSON->email
  ]);
  if ($braintreeResponse->success) {
    echo(json_encode($braintreeResponse));
  } else {
    echo(json_encode($braintreeResponse));
  }

  function get_data($url) {
    $ch = curl_init();
    $timeout = 5;
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
    $data = curl_exec($ch);
    curl_close($ch);
    return $data;
  }

  $googleResponse = get_data('https://script.google.com/macros/s/AKfycbzz8Oh3Jqt5tP4wGcNyM8jVhwaMEr6S5AJ-MWqFlhPN1rSzBdSr/exec?name='.urlencode(stripslashes($requestJSON->userName)));

  function get_string_between($string, $start, $end){
      $string = ' ' . $string;
      $ini = strpos($string, $start);
      if ($ini == 0) return '';
      $ini += strlen($start);
      $len = strpos($string, $end, $ini) - $ini;
      return substr($string, $ini, $len);
  }

  $googleResponseParsed = get_string_between($googleResponse, '<title>', '</title>');

  echo($googleResponseParsed);
$username = $requestJSON->userName;
$username = mysqli_real_escape_string($mysqli, $username);
$firstname = $requestJSON->firstName;
$firstname = mysqli_real_escape_string($mysqli, $firstname);
$lastname = $requestJSON->lastName;
$lastname = mysqli_real_escape_string($mysqli, $lastname);
$email = $requestJSON->email;
$email = mysqli_real_escape_string($mysqli, $email);
$cleanGoogleResponseParsed = $googleResponseParsed;
$cleanGoogleResponseParsed = mysqli_real_escape_string($mysqli, $cleanGoogleResponseParsed);
$customerid = $braintreeResponse->customer->id;
$customerid = mysqli_real_escape_string($mysqli, $customerid);

$password = $requestJSON->password;
$encryptedpassword=password_encrypt($password);
$selectcount="SELECT COUNT(*) as exist FROM user WHERE userName='$username'";
$countresult=mysqli_query($mysqli, $selectcount);
while($row=mysqli_fetch_assoc($countresult)){
    $exists=$row['exist'];
}
if($exists==0){
  $makeUserSQL = "INSERT INTO user (userName, firstName, lastName, email, driveFolderId, braintreeId, password)
  VALUES ('".$username."','".$firstname."','".$lastname."','".$email."','".$cleanGoogleResponseParsed."','".$customerid."','".$encryptedpassword."')";

  if ($mysqli->query($makeUserSQL) === TRUE) {
      echo "New record created successfully";
      $_SESSION['inserted']=1;
  } else {
      echo "Error: " . $makeUserSQL . "<br>" . $mysqli->error;
  }
} else {$_SESSION['userexists']=1;}
$mysqli->close();

?>

<?php session_start();
if(isset($_SESSION['hitpage'])){$ajaxworked=1;} else{$ajaxworked=0;}
if(isset($_SESSION['inserted'])){$inserted=1;} else {$inserted=0;}
if(isset($_SESSION['userexists'])){$userexists=1;} else{$userexists=0;}
if($inserted==1 and $ajaxworked==1){echo 'Congrats you seccessfully created your account click <a href="index.php">here</a> to go home';}
if($ajaxworked==0){echo 'Possible time out if error prosists please contact creative group click <a href="signuptest.php">here</a> to try again';}
if($inserted==0 and $ajaxworked==1 and $userexists==0){echo 'There was an error creating your account if error prosists please contact the creative group click <a href="signuptest.php">here</a> to try again';}
if($userexists==1){echo 'Sorry that user already exists click <a href="signuptest.php">here</a> to try again';}
session_destroy();
?>