这里的setTimeout 0是解决什么问题呢

Question

  if (!this.isShown()) {

    return;

  }

  this.$container.trigger('beforeHide.modal.cmp', {modal: this});

  this.$container.addClass(HIDE_CLS);

  setTimeout(function () {

    this.$container.trigger('afterHide.modal.cmp', {modal: this});

  }.bind(this), 0);