Function off

06.Router/basic/js/vue.js:1283–1285

* Remove event listener shorthand. * * @param {Element} el * @param {String} event * @param {Function} cb

(el, event, cb)

   */

  function off(el, event, cb) {
    el.removeEventListener(event, cb);
  }

  /**
   * For IE9 compat: when both class and :class are present