Angularjs $http post request data and response with undefine - Angularjs $http post request data and response with undefined error

Angularjs $http post request data and response with undefined error

我想从服务器端获得特定的值。因此，我使用$http将变量从前端(Angularjs javascript)传递到后端(php)。在服务器端(php)从前端获取值之后。它将运行sql查询从mysql中获取数据并将数据返回给前端。然而，在我的前端控制台，它显示未定义的错误。下面是我的代码:

前端Javascript

$http({
    method: "post",
    url: "http://localhost/php/UpdateLastLogin.php",
    data: {
        user_name: user_name,
        CurrentTimestamp: CurrentTimestamp
        },
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
}).success(function(response) {
    console.log(response);
}).error(function(response) {
    console.log(response);
});

后端PHP

<?php
    header("Access-Control-Allow-Origin: *");
    header("Access-Control-Allow-Credentials: true");
    header("Access-Control-Allow-Methods: POST, GET, OPTIONS");
    header("Access-Control-Allow-Headers: Content-Type, Authorization, X-Requested-With");
    header('P3P: CP="CAO PSA OUR"'); 
    header("Content-Type: application/json; charset=utf-8");

    $postdata = file_get_contents("php://input");
    $request = json_decode($postdata);
    @$CurrentTimestamp = $request->CurrentTimestamp;
    @$user_name = $request->user_name;
    $servername = "localhost";
    $username = "jack";
    $password = "1234";
    $dbname = "daikinchat";
    $CurrentTimestamp = '"' . $CurrentTimestamp . '"';
    //$user_name = '"' . $user_name . '"';
    $user_name = "Lisa Wong";
    $conn = new mysqli($servername, $username, $password, $dbname);
        if ($conn->connect_error) {
            die("Connection failed: " . $conn->connect_error);
        }
    $query = "SELECT last_login_timestamp FROM user_directory WHERE username = '$user_name'";
    $result = mysqli_query($conn, $query);
    $row = mysqli_fetch_row($result);
    echo $row[0];
?>

问题可能是在你的$http调用，我的$http调用看起来像:

$http({
            method: 'post',
            url:'http://localhost/php/UpdateLastLogin.php',
            data: {...},
            config: 'Content-Type: application/json;'
        }).then(function (response) {
            console.log(response);
        }, function (response) {
            console.log(response);
        });

如果我没有错，你可以使用两者，头或配置，但似乎你没有正确使用属性头，文档说:

headers - {function([headerName])} - Header getter函数。
config - {Object} -用来生成请求的配置对象。

所以试着把你的'Content-Type'改成'application/json'，因为那是你在http请求体中发送的内容。如果不工作，将headers改为config到test.

如果它也不工作，我会使用任何工具，如'postman'来检查API，并确保它是工作的，并尝试调试PHP代码(我不能帮助你与这部分)