JQuery .hasClass for multiple values in an if statement

if ($('html').is('.m320, .m768')) { ... }
//https://stackoverflow.com/questions/10559153/jquery-hasclass-for-multiple-values-in-an-if-statement
var $html = $("html");

if ($html.hasClass('m320') || $html.hasClass('m768')) {

  // do stuff 
  // https://stackoverflow.com/questions/10559153/jquery-hasclass-for-multiple-values-in-an-if-statement

}