watch: {
    /** 监听 */
    listening (val) {
      /** 自定义事件 */
      var that = this
      for (var i = 1; i <= 10; i++) {
        (function (k) {
          setTimeout(() => {
            for (var j = 0; j < that.eventList.length; j++) {
              --k--
            }
          }, (k - 1) * 700)
        })(i)
      }
    }
  }