每个人我是WP的新手，正在尝试构建插件。我有以下代码正常工作：

add_filter(\'the_content\', \'say_hello\');
function say_hello($content){
    if(is_single() || is_page()){
        print $content." Thank you for reading!";
    } else {
        print $content;
    }
}

add_action(\'init\', \'prepare_head\');
function prepare_head(){
    if(is_single() || is_page()){
        // include javascripts
        wp_enqueue_script("jquery");
        //some more js goes here (registered and enqueued)... 

        //include css
        $styleSrc = plugins_url("css/style.css", __FILE__);
        wp_register_style("say_hello_style", $styleSrc);
        wp_enqueue_style("say_hello_style");
    }
}