code: function removeClass(elm, name) {
          if (name) {
              var cls = className(elm),
                  names;
  
              if (langx.isString(name)) {
                  names = name.split(/\s+/g);
              } else {
                  names = name;
              }
  
              names.forEach(function(klass) {
                  var re = classRE(klass);
                  if (cls.match(re)) {
                      cls = cls.replace(re, " ");
                  }
              });
  
              className(elm, cls.trim());
          } else {
              className(elm, "");
          }
  
          return this;
      }
docs: /*
  Remove a single class, multiple classes, or all classes from each element in the set of matched elements.
  @param {HTMLElement} elm
  @param {String} name