drupal中添加外部js(三)

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I've opted for the third method. First I created a file called external-js.tpl.php in my theme directory, containing this:

<script type="text/javascript" src="">
?>

Then, in my template.php file, I created a pre-process function that loads that into a variable and adds the appropriate JS function call to $footer:

function Nefertari_preprocess_page(&$vars){
    $path = drupal_get_path('theme', 'Nefertari');
    $vars['external_js'] = theme_render_template($path.'/external-js.tpl.php', $vars);
    $vars['footer'] .= '';
}
?>

Lastly, I modified page.tpl.php to print the variable $external_js right after $script in the header. I could also have printed it right before the footer, and that might have been better for performance. There's actually a module for Google Analytics already, but it doesn't fit my needs very smoothly (it's designed for single sites, when I'm working with a multi-site install of nearly a hundred distinct Drupals).