code: function ( property, value ) {
              var el = this.element();
              //setter
              if ( value || value == 0 ) {
                  el.setProperty( property, String(value), null );
                  //getter
              } else {
                  return el.getPropertyValue( property );
              }
          }
docs: 타겟타입:(Style, cssRule.style등등..)
  Style Property를 설정하거나 반환.
  @param	{String}	property	'z-index'표기방법
  @return	{Property Value}