Joomla没有使用自定义组件执行script.php单击更新

Question

我开发了一个自定义组件，并且我已经创建了一个更新服务器以启用一次点击更新。

当我手动更新我的组件（com_mediacenter）时，script.php可以正常工作但是当我使用com_joomlaupdate进行一次点击更新时，我会收到一条消息，说明更新有效，但是script.php未启动。

update.xml：

 <?xml version="1.0" encoding="UTF-8"?>
    <extension type="component" version="3.6.2" method="upgrade">
      <name>com_mediacenter</name>
      <creationDate>August 2016</creationDate>
      <author>Me</author>
      <authorEmail>mail@mail.com</authorEmail>
      <authorUrl>http://www.***.com</authorUrl>
      <copyright>(C) 2016 - All rights reserved</copyright>
      <license>License Info</license>
      <description>Mediacenter 3.5.3</description>
      <scriptfile>script.php</scriptfile>
      <files folder="site">
        <folder>assets</folder>
        <filename>controller.php</filename>
        <folder>controllers</folder>
        <folder>helpers</folder>
        <filename>index.html</filename>
        <folder>language</folder>
        <folder>lib</folder>
        <filename>mediacenter.php</filename>
        <folder>models</folder>
        <folder>views</folder>
      </files>
      <media destination="com_mediacenter" folder="media">
        <folder>videos</folder>
      </media>
      <administration>
        <menu>COM_MEDIACENTER</menu>
        <files folder="admin">
          <filename>config.xml</filename>
          <filename>index.html</filename>
          <folder>language</folder>
          <filename>mediacenter.php</filename>
          <filename>mediacenter.xml</filename>
          <folder>sql</folder>
        </files>
      </administration>
      <updateservers>
        <server type="extension" priority="1" name="com_mediacenter">https://inwicast.me/updates/mediacenter3/mdcr_update.xml</server>
      </updateservers>
    </extension>

的script.php：

<?php
defined('_JEXEC') or die('Restricted access');

class com_mediacenterInstallerScript
{
     function install( $parent ) {
         echo '<p>install</p>';
     }
     function uninstall( $parent ) {
        echo '<p>uninstall</p>';
    }
     function update( $parent ) {
        echo '<p>update</p>';
     }
     function preflight( $type, $parent ) {
        echo '<p>preflight</p>';
     }
     function postflight( $type, $parent ) {
        echo '<p>postflight</p>';
   }
}
?>

提前致谢