Add Script/Code to Head Tag and Body Tag

/* Add Script/Code to Head Tag */
function add_code_to_head() {
    /** Your Script */
    ?>
    <!-- Your Script -->
    <?php
}
add_action( 'wp_head', 'add_code_to_head' );

/* Add Script/Code to Body Tag */
function add_code_to_body() {
    /** Your Script */
    ?>
    <!-- Your Script -->
    <?php
}
add_action( 'jnews_after_body', 'add_code_to_body', 1 );