You could use HTML5 data-*
attributes. Let’s suppose that you want to perform some action when some DOM element such as a div is clicked. So:
<div id="foo" data-url="https://stackoverflow.com/questions/7902213/@Url.Content("~/foobar")">Click me</div>
and then in your separate javascript file you could work unobtrusively with the DOM:
$('#foo').click(function() {
var url = $(this).data('url');
// do something with this url
});
This way you could have a pure separation between markup and script without you ever needing any server side tags in your javascript files.