code: function(val) {
        return val === undefined ? (this.length ? this[0].clientHeight || this[0].innerHeight : 0) : this.each(function(index, el) {
          el.style.height = val + 'px';
        });
      }
docs: height method
  get or set element height
  @param  {number} [val]  - new height
  @return {number} height