正确的方法是将数据发布回WordPress admin ajax url，然后在PHP函数中使用$_POST 变量。

将类别id传递回wordpress的jQuery函数示例：

function cat_edit_get() {
    jQuery( "#loading-animation").show();
    var catID = jQuery("#cat :selected").val();
    var text = jQuery("#cat :selected").text();
    jQuery(\'#replace\').html(text);

    jQuery.ajax({
        type: \'POST\',
        url: ajaxurl,
        data: {"action": "cat-editor-get", cat: catID },
        success: function(response) {
            jQuery("#the-list").html(response);
            jQuery("#loading-animation").hide();
            return false;

        }
    });

}

add_action ( \'wp_ajax_cat-editor-get\', \'cat_editor_get\' );
    function cat_editor_get () {
        $cat_id = $_POST[ \'cat\' ];
        $preview_cats = get_post_meta ( 82799, \'_\' . $cat_id . \'saved\', true );
        $item_order = $preview_cats[ \'cat_order\' ];
        $post_ids = explode ( ",", $item_order, 30 );
        global $post;
        if ( count ( $post_ids ) < 5 ) {
            $args = array (
                \'category_id\' => $cat_id,
                \'length\' => 30,

            );

            $post_ids = wndsq_get_post_ids ( $args );
        }