       reflowed: function () {
            this.isBusy = false
          }
        }
      })

      document.body.addEventListener('click', function () {
        app.shuffle()
        // app.$refs.waterfall.$emit('reflow') // manually trigger reflow action
      }, false)

      window.addEventListener('scroll', function () {
        var scrollTop = document.documentElement.scrollTop || document.body.scrollTop
        if (scrollTop + window.innerHeight >= document.body.clientHeight) {
          app.addItem