请帮助我理解为什么会这样。

我已经在mu中加载了jQueryfunctions.php-文件如下：

<?php 
    function load_jquery() {
        wp_enqueue_script( \'jquery\' );
    }

    add_action( \'wp_enqueue_scripts\', \'load_jquery\' );
?>

我知道这是唯一正确的方法<但是现在问题来了github page
我下载了一个。要添加到我的网站的zip文件

为此，我必须在我的header.php-文件：

    <script src="<?php bloginfo(\'template_directory\')?>/js/modernizr-2.6.2.min.js"></script>
    <script src="<?php bloginfo(\'template_directory\')?>/js/jquery-1.9.1.min.js"></script>
    <script src="<?php bloginfo(\'template_directory\')?>/js/jquery.cookie-1.3.1.js"></script>
    <script src="<?php bloginfo(\'template_directory\')?>/js/jquery.steps.js"></script>

我第一次这样做时，我忽略了jquery-1.9.1.min.js 文件，因为我认为jQuery已经加载完毕。它不起作用。

在我添加了jQuery文件之后，整个事情变得像它应该的那样。

我不明白的是为什么我必须加载jQuery两次。

我使用WP 4.4.2

谁能给我解释一下吗？

----------更新-------------
所以我发现加载的顺序很重要<演示文件（github链接）按以下顺序说明：

<script src="../lib/modernizr-2.6.2.min.js"></script>
<script src="../lib/jquery-1.9.1.min.js"></script>
<script src="../lib/jquery.cookie-1.3.1.js"></script>
<script src="../build/jquery.steps.js"></script>

如果我更改jquery-1.9.1.min.js 把它放在底部，一切都停止了。如果我把它放在上面jquery.steps.js 一切又恢复了。

这是演示版。如果我将其转换为WordPress安装，则无法编辑wp_head().这是我的wp_head()-输出如下所示：

<script src="http://192.168.104.105:8888/basic/wp-includes/js/jquery/jquery.js?ver=1.11.3" type="text/javascript">
<script src="http://192.168.104.105:8888/basic/wp-includes/js/jquery/jquery-migrate.min.js?ver=1.2.1" type="text/javascript">
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery-parallax/1.1.3/jquery-parallax-min.js?ver=4.4.2" type="text/javascript">
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery-localScroll/1.3.5/jquery.localScroll.min.js?ver=4.4.2" type="text/javascript">
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery-scrollTo/1.4.11/jquery.scrollTo.min.js?ver=4.4.2" type="text/javascript">
<script src="http://192.168.104.105:8888/basic/wp-content/themes/basic_theme/js/modernizr-2.6.2.min.js?ver=4.4.2" type="text/javascript">
<script src="http://192.168.104.105:8888/basic/wp-content/themes/basic_theme/js/jquery.cookie-1.3.1.js?ver=4.4.2" type="text/javascript">
<script src="http://192.168.104.105:8888/basic/wp-content/themes/basic_theme/js/jquery.steps.js?ver=4.4.2" type="text/javascript">
<script src="http://192.168.104.105:8888/basic/wp-content/themes/basic_theme/js/modernizr.js?ver=4.4.2" type="text/javascript">
<script src="http://192.168.104.105:8888/basic/wp-content/themes/basic_theme/js/mootools.js?ver=4.4.2" type="text/javascript">
<script src="http://192.168.104.105:8888/basic/wp-content/themes/basic_theme/js/slimbox.js?ver=4.4.2" type="text/javascript">
<script src="http://192.168.104.105:8888/basic/wp-content/themes/basic_theme/js/modernizr_team.js?ver=4.4.2" type="text/javascript">

是否应更改的输出顺序（如果可能）wp_head()

我还尝试加载jquery.steps.js 中的文件wp_footer() 但运气不好

登记和排队：

function pr_scripts_styles() {

wp_enqueue_script(\'jquery\'); // just enqueue as its already registered 
wp_enqueue_script( \'jquery_parallax\', \'//cdnjs.cloudflare.com/ajax/libs/jquery-parallax/1.1.3/jquery-parallax-min.js\' );
wp_enqueue_script( \'jquery_localscroll\', \'//cdnjs.cloudflare.com/ajax/libs/jquery-localScroll/1.3.5/jquery.localScroll.min.js\' );
wp_enqueue_script( \'jquery_scrollto\', \'//cdnjs.cloudflare.com/ajax/libs/jquery-scrollTo/1.4.11/jquery.scrollTo.min.js\' );
wp_enqueue_script( \'jquery_scrollto\', \'//cdnjs.cloudflare.com/ajax/libs/jquery-scrollTo/1.4.11/jquery.scrollTo.min.js\' );

/*   REGISTER ALL JS FOR SITE */
wp_register_script(\'modernizr_2_6_2\',get_stylesheet_directory_uri().\'/js/modernizr-2.6.2.min.js\', array( \'jquery\' ));
wp_register_script(\'jquery_cookie_1_3_1\',get_stylesheet_directory_uri().\'/js/jquery.cookie-1.3.1.js\', array( \'modernizr_2_6_2\'));
wp_register_script(\'jquery_steps\',get_stylesheet_directory_uri().\'/build/jquery.steps.js\',array( \'jquery_cookie_1_3_1\' ),\'\',false);
wp_register_script(\'modernizr\',get_stylesheet_directory_uri().\'/js/modernizr.js\');
wp_register_script(\'mootools\',get_stylesheet_directory_uri().\'/js/mootools.js\');
wp_register_script(\'slimbox\',get_stylesheet_directory_uri().\'/js/slimbox.js\');
wp_register_script(\'modernizr_team\',get_stylesheet_directory_uri().\'/js/modernizr_team.js\');


/*   REGISTER ALL CSS FOR SITE */
wp_register_style(\'font_awesome\',get_stylesheet_directory_uri().\'/font-awesome/4.5.0/css/font-awesome.css\');
wp_register_style(\'normalize\',get_stylesheet_directory_uri().\'/css/normalize.css\');
wp_register_style(\'main\',get_stylesheet_directory_uri().\'/css/main.css\');
wp_register_style(\'jquery_steps\',get_stylesheet_directory_uri().\'/css/jquery.steps.css\');
wp_register_style(\'slimbox_css\',get_stylesheet_directory_uri().\'/css/slimbox.css\');
wp_register_style(\'teammembers\',get_stylesheet_directory_uri().\'/css/teammembers.css\');

/*   CALL ALL CSS AND SCRIPTS FOR SITE */
wp_enqueue_script(\'modernizr_2_6_2\');
wp_enqueue_script(\'jquery_cookie_1_3_1\');
wp_enqueue_script(\'jquery_steps\');
wp_enqueue_script(\'modernizr\');
wp_enqueue_script(\'mootools\');
wp_enqueue_script(\'slimbox\');
wp_enqueue_script(\'modernizr_team\');

wp_enqueue_style(\'font_awesome\');
wp_enqueue_style(\'normalize\');
wp_enqueue_style(\'main\');
wp_enqueue_style(\'jquery_steps\');
wp_enqueue_style(\'slimbox_css\');
wp_enqueue_style(\'teammembers\');
}
add_action( \'wp_enqueue_scripts\', \'pr_scripts_styles\' );

wp_register_script (
    \'yourscripthandle\', //string $handle: a string to identify this script
    get_bloginfo( \'template_url\' ) . \'/js/yourcustomjs.js\', //string $src: Path of your script file
    array (\'jquery\' ), // array $deps = array(): defining which scripts your script is dependend on. In your case, it\'s jQuery.
    \'\', // string|bool $ver = false: The version of your Script
    true //bool $in_footer = false: whether your script should be enqueued in `wp_head()` or `wp_footer()`
);
wp_enqueue_script( \'yourscripthandle\' );