Is_page()函数不起作用

我正在尝试将这些自定义CSS和JS（编写在自定义插件中）添加到特定页面。

这是我的密码

<?php   

function randomAlphaNumeric($length) {
    $pool = array_merge(range(0,9), range(\'a\', \'z\'),range(\'A\', \'Z\'));
    $key=\'\';
    for($i=0; $i < $length; $i++) {
        $key .= $pool[mt_rand(0, count($pool) - 1)];
    }
    return $key;
}



add_action(\'init\', \'register_script\');
function register_script(){
    if(is_page(\'page_title\')) {
        wp_register_script( \'custom_js\', plugins_url(\'/js/custom-js.js\', __FILE__).\'?random=\'.randomAlphaNumeric(5), array(\'jquery\'));
        wp_register_style( \'new_style\', plugins_url(\'/css/new-style.css\', __FILE__).\'?random=\'.randomAlphaNumeric(5), false, \'all\');
    }
}


// use the registered jquery and style above
add_action(\'wp_enqueue_scripts\', \'enqueue_style\');
function enqueue_style(){
    if(is_page(\'page_title\')) {
        wp_enqueue_script(\'custom_js\');
        wp_enqueue_style( \'new_style\' );
    } 
}

但是is_page() 似乎根本不起作用。。我试着用ID 和SLUG, 但没有成功

UPDATE替换了检查页面标题的条件，仍然不起作用

add_action(\'init\', \'register_script\');
function register_script(){
    global $post;
    if($post->post_title == \'page_title\') {
        wp_register_script( \'custom_js\', plugins_url(\'/js/custom-js.js\', __FILE__).\'?random=\'.randomAlphaNumeric(5), array(\'jquery\'));
        wp_register_style( \'new_style\', plugins_url(\'/css/new-style.css\', __FILE__).\'?random=\'.randomAlphaNumeric(5), false, \'all\');
    }
}


// use the registered jquery and style above
add_action(\'wp_enqueue_scripts\', \'enqueue_style\');
function enqueue_style(){
    global $post;
    if($post->post_title == \'page_title\') {
        wp_enqueue_script(\'custom_js\');
        wp_enqueue_style( \'new_style\' );
    } 
}

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