Function addClass

tests/qunit-2.9.2.js:4619–4623

(elem, name)

  	}

  	function addClass(elem, name) {
  		if (!hasClass(elem, name)) {
  			elem.className += (elem.className ? " " : "") + name;
  		}
  	}

  	function toggleClass(elem, name, force) {
  		if (force || typeof force === "undefined" && !hasClass(elem, name)) {