text: /**
   * Bind after-leave event for vue instance. Make sure after-leave is called in any browsers.
   *
   * @param {Vue} instance Vue instance.
   * @param {Function} callback callback of after-leave event
   * @param {Number} speed the speed of transition, default value is 300ms
   * @param {Boolean} once weather bind after-leave once. default value is false.
   */
  export default function(instance, callback, speed = 300, once = false) {
    if (!instance || !callback) throw new Error('instance & callback is required');
    let called = false;
    const afterLeaveCallback = function() {
      if (called) return;
      called = true;
      if (callback) {
        callback.apply(null, arguments);
      }
    };
    if (once) {
      instance.$once('after-leave', afterLeaveCallback);
    } else {
      instance.$on('after-leave', afterLeaveCallback);
    }
    setTimeout(() => {
      afterLeaveCallback();
    }, speed + 100);
  };
  