所有的CSS和JavaScript文件必须在主题的info文件中指定

In Drupal 6 style.css and script.js would be included in your theme automatically, even if they weren't present in the theme's .info file. In Drupal 7, themes must specify these files in the .info file to include them. More information about this change can be seen at #351487: Remove default values for stylesheet and scripts includes from system module. If your theme doesn't use these files, or if they are all ready specified in your theme's info file, no changes are required.