这里是一个起点，通过查看单词计数是如何在/wp-admin/js/post.js 文件：

/**
 * Testing word price calculations
 */
add_action( \'after_wp_tiny_mce\', function()
{ ?><script>
    ( function( $ ) {
        $( function() {
            // Init
            var $content = $( \'#content\' ),
                $count = $( \'#wp-word-count\' ).find( \'.word-count\' ),
                total_price = 0,
                price_per_word = 0.02;

            // Out price updating function
            function wpse_update_price(){
                total_price = $count.html() * price_per_word;
                // Debug output
                console.log( \'Total price: \' + total_price );
            }

            // On keyup event 
            $content.on( \'input keyup\', _.debounce( wpse_update_price, 1100 ) );
        } );
    } )( jQuery );
</script><?php
} );