直接上代码：

$url = $this->getConfig ()->url ();
$content = "var url={ base:'{$url->base}',css:'{$url->css}',js:'{$url->js}',img:'{$url->img}',current:window.location};";
$expire = 604800;
header ( 'Content-type: application/x-javascript' );
header ( 'Cache-Control: max-age=' . $expire );
header ( 'Accept-Ranges: bytes' );
header ( 'Content-Length: ' . strlen ( $content ) );
echo $content;