Function attach

06.Router/basic/js/vue.js:3914–3918

* Call attach hook for a Vue instance. * * @param {Vue} child

(child)

   */

  function attach(child) {
    if (!child._isAttached && inDoc(child.$el)) {
      child._callHook('attached');
    }
  }

  /**
   * Call detach hook for a Vue instance.