我有一个桌面应用程序，我使用$.getJSON 要使用插件从我的wordpress站点获取数据WP REST API. 这很好，因此我假设我也可以对函数中的函数进行Ajax调用。php？我该怎么做？我所看到的示例都没有提供ajaxURL。我怎么知道这是什么？

我有以下代码：

Functions.php (in wordpress site on server)

//Called by Ajax from App - list the contents of the folder so they can be downloaded and stored locally
function folder_contents() {

    $folderPath = $_POST[\'path\'] ;
    $files = array_diff(scandir($path), array(\'.\', \'..\'));
    print_r($files);
    return $files;

    die(); 
}

add_action(\'wp_ajax_my_action\', \'folder_contents\');

app.js (run using node webkit locally from machine)

//ajax call 
var data = {
    action: \'path\',
    path: datafolder;
};
var ajaxurl = baseurl + \'\';  //WHAT IS THIS?!?!
jQuery.post(ajaxurl, data, function(response) {
    alert(\'Got this from the server: \' + response);
    console.log(response);
});

-------------------EDIT----------------------

在回答了下面的问题后，我根据建议尝试了下面的代码，但我得到了

“index.html:324未捕获引用错误：未定义ajax\\u参数”

Functions.php

//add code to use ajax
function add_ajax_script() {

    wp_localize_script( \'ajax-js\', \'ajax_params\', array( \'ajax_url\' => admin_url( \'admin-ajax.php\' ) ) );

}

//Called by Ajax from App - list the contents of the folder so they can be downloaded and stored locally

function folder_contents() {

    $folderPath = $_POST[\'path\'] ;
    $files = array_diff(scandir($path), array(\'.\', \'..\'));
    wp_send_json($files);

    die(); 
}

add_action(\'wp_ajax_folder_contents\', \'folder_contents\');
add_action(\'wp_ajax_nopriv_folder_contents\', \'folder_contents\');


add_action( \'wp_enqueue_scripts\', \'add_ajax_script\' );

App.js

//ajax call 
        var data = {action: \'powerpoint_folder_contents\',path: datafolder};
        var ajaxurl =  ajax_params.ajax_url;
        console.log(ajaxurl);
        jQuery.post(ajaxurl, data, function(response) {
            alert(\'Got this from the server: \' + response);
            console.log(response);
        });

如果我删除add_ajax_script() 函数，只需使用下面的返回0。

var ajaxurl=baseurl+\'wp admin/admin ajax。php’；

请帮助。。。

//ajax call 
var data = {
    action: \'folder_contents\',
    path: datafolder
};
var ajaxurl = baseurl + \'\';  //WHAT IS THIS?!?!
jQuery.post(ajaxurl, data, function(response) {
    alert(\'Got this from the server: \' + response);
    console.log(response);
});

//Called by Ajax from App - list the contents of the folder so they can be downloaded and stored locally
function folder_contents() {

$folderPath = $_POST[\'path\'] ;
$files = array_diff(scandir($path), array(\'.\', \'..\'));
print_r($files);
return $files;

die(); 
}

add_action(\'wp_ajax_folder_contents\', \'folder_contents\');
add_action(\'wp_ajax_nopriv_folder_contents\', \'folder_contents\');

add_action( \'wp_enqueue_scripts\', \'google_js_script\' );

function google_js_script()
{
  // Enqueue the js script     
  wp_enqueue_script(\'google-js\', GOOGLE_PLG_URL . \'assets/js/google-places.js\', array(\'jquery\'), true);

  // Localize the enqueued JS script
  wp_localize_script( \'google-js\', \'ajax_object\',
    array( \'ajax_url\' => admin_url( \'admin-ajax.php\' ), \'place\' => \'\' ) );
}