钩入\'admin_footer-post-new.php\' 和\'admin_footer-post.php\', 检查全局变量$post_type:

add_action( \'admin_footer-post-new.php\', \'wpse_73692_script\' );
add_action( \'admin_footer-post.php\', \'wpse_73692_script\' );

function wpse_73692_script()
{
    if ( \'post\' !== $GLOBALS[\'post_type\'] )
        return;

    ?>
<script>alert( \'<?php echo $GLOBALS[\'post_type\'];?>\' );</script>
    <?php
}