要在ajax中使用外部脚本，必须注册一个操作来触发它。为此，您需要使用wp\\u ajax\\u YourAction和wp\\u ajax\\u nopriv\\u YourAction

add_action(\'wp_ajax_YourAction\', \'myAjaxFunction\');
// just a way to quickly print your js
add_action(\'wp_head\', \'print_js\');

function print_js(){
    ?><script type="text/javascript" >
            jQuery(document).ready(function($) {
                var data = {
                        action: \'YourAction\',
                        fun: \'42\',

                    };
                $.post(ajaxurl, data, function(response) {
                        console.log(response);
                        var json = $.parseJSON(response);

                        alert(\'the fun number is\'+response.fun);

                });
            });
    </script><?php
}
function myAjaxFunction(){
    if(isset($_POST[\'fun\'])){
        $action = $_POST[\'fun\'];
    }

    switch ($action) {

        case \'fun\':
            echo json_encode(array(\'fun\'=>$_POST[\'fun\']+1))
            exit();
        break;

        default:
        break;
}