className.has
    className.has.call(el, cls)
  
  Determine wheter a DOM node has a given class name.
var className = require("can-util/dom/class-name/class-name");
var isContainer = className.has.call(el, "container");
  
  Parameters
- className 
{String}:A string representing a single class name token
 
Returns
 {Boolean}: 
true if the element's class attribute contains the token, false otherwise.