swiper 滑动bug

[gaollard]

拖动停止后，swipe 停留位置异常

[gaollard]

bug原因：

    slideTo (index, useAnimation = true) {
      if (this.isUseLoopMode) {
        if (index > this.swipes.length) {
          throw 'invalid slide index'
        }
      } else {
        if (index > this.swipes.length -1) {
          throw 'invalid slide index'
        }
      }
      // animating 这时为 true
      // if (this.animating) {
      //   return
      // }