message: [bugfix] Spelling of 'touchcancel '
diff: @touchstart="onTouchStart"
  @touchmove="onTouchMove"
  @touchend="onTouchEnd"
  - @touchcalcel="onTouchEnd"
  + @touchcancel="onTouchEnd"
  >
  <div class="van-pull-refresh__head">
  <slot name="normal" v-if="status === 'normal'"></slot>
  