<?php
/**
 * The template for displaying the header
 *
 * Displays all of the head element and everything up until the "site-content" div.
 *
 * @package WordPress
 * @subpackage Twenty_Fifteen
 * @since Twenty Fifteen 1.0
 */
?><!DOCTYPE html>

function add_prism() {
        wp_register_style(
            'prismCSS', 
            get_stylesheet_directory_uri() . 'prism/prism.css' //自定义路径
         );
          wp_register_script(
            'prismJS',
            get_stylesheet_directory_uri() . 'prism/prism.js'   //自定义路径
         );
        wp_enqueue_style('prismCSS');
        wp_enqueue_script('prismJS');
    }
add_action('wp_enqueue_scripts', 'add_prism');