我会通过钩住save_post 操作，而不是javascript。

主要的想法是检查这两个值是否都存在（您的单选按钮被选中post_thumbnail ，如果没有，则将帖子设置为草稿，如果用户未满足要求，则显示信息。

首先，钩入save_post 操作，并检查单选按钮是否具有您的值，以及是否选择了Post缩略图。如果一切正常，则无需执行任何其他操作，但在特殊情况下，您必须阻止发布帖子，并显示错误消息以通知用户。

<?php
// this function checks if the checkbox and the thumbnail are present
add_action(\'save_post\', \'f711_option_thumbnail\');

function f711_option_thumbnail($post_id) {
    // get the value that is selected for your select, don\'t know the specifics here
    // you may need to check this value from the submitted $_POST data.
    $checkoptionvalue = get_post_meta( $post_id, "yourmetaname", true );
    if ( !has_post_thumbnail( $post_id ) && $checkoptionvalue == "yourvalue" ) {
        // set a transient to show the users an admin message
        set_transient( "post_not_ok", "not_ok" );
        // unhook this function so it doesn\'t loop infinitely
        remove_action(\'save_post\', \'f711_option_thumbnail\');
        // update the post set it to draft
        wp_update_post(array(\'ID\' => $post_id, \'post_status\' => \'draft\'));
        // re-hook this function
        add_action(\'save_post\', \'f711_option_thumbnail\');
    } else {
        delete_transient( "post_not_ok" );
    }
}

// add a admin message to inform the user the post has been saved as draft.

function showAdminMessages()
{
            // check if the transient is set, and display the error message
    if ( get_transient( "post_not_ok" ) == "not_ok" ) {
        // Shows as an error message. You could add a link to the right page if you wanted.
        showMessage("You need to select a Post Thumbnail if you choose this Option. Your Post was not published.", true);
                // delete the transient to make sure it gets shown only once.
        delete_transient( "post_not_ok" );
    }

}   
add_action(\'admin_notices\', \'showAdminMessages\');       
// function to display the errormessage
function showMessage($message, $errormsg = false)
{
    if ($errormsg) {
        echo \'<div id="message" class="error">\';
    }
    else {
        echo \'<div id="message" class="updated fade">\';
    }

    echo "<p><strong>$message</strong></p></div>";

}   


?>