How to call ajax in wordpress

Question

My ajax call output is always showing 0 as output don\'t know why

In functions.php I have this code

function get_data() {
    $abc = \'         


        

Answer 1

    Name:
    

    Email:
    

    Phone:
    

    Address:
    

    
    

functions.php

wp_enqueue_script('jquery');

function addCustomer() {

    global $wpdb;

    $name = $_POST['name'];
    $phone = $_POST['phone'];
    $email = $_POST['email'];
    $address = $_POST['address'];

    if ( $wpdb->insert( 'customers', array(
        'name' => $name,
        'email' => $email,
        'address' => $address,
        'phone' => $phone
    ) ) === false ) {
        echo 'Error';
    } else {
        echo "Customer '".$name. "' successfully added, row ID is ".$wpdb->insert_id;
    }
    die();
}
add_action('wp_ajax_addCustomer', 'addCustomer');
add_action('wp_ajax_nopriv_addCustomer', 'addCustomer');

javascript