app.rb

@view= 'Something'

input.haml

-location= 'Some_location'

:javascript
  var a ='#{location}';
  var a ='#{@view}';

output.html

<script type='text/javascript'> 
  //<![CDATA[
    var a ='Some_location';
    var b ='Something';
  //]]>
</script>