vue 手機觸屏滑動

功能：iview Carousel 走馬燈，我須要在phone上實現滑動切換功能。

<div class="phone" @touchstart="phone_mouseS" @touchend="phone_mouseE">
<Carousel :autoplay-speed="5000" v-model="phone_mouseMIndex" autoplay :value="0" loop v-if="menuChoose == '/'">
  <CarouselItem>
    <img class="img" src="../../static/common/phone_banner_index1.jpg" />
  </CarouselItem>
  <CarouselItem>
    <img class="img" src="../../static/common/phone_banner_index1.jpg" />
  </CarouselItem>
  <CarouselItem>
    <img class="img" src="../../static/common/phone_banner_index3.jpg" />
  </CarouselItem>
</Carousel>
</div>

data() {
return {
  phone_mouseMIndex: 0, // phone端 滑動索引
  phone_mouseMX0: 0, // phone端 滑動索引
  phone_mouseMX1: 0, // phone端 滑動索引
}
},
...
// phone端 滑動開始
phone_mouseS(e){
  this.phone_mouseMX0 = e.changedTouches[0].pageX;
},
// phone端 滑動結束
phone_mouseE(e){
  this.phone_mouseMX1 = e.changedTouches[0].pageX;
  let tag = this.phone_mouseMX1 - this.phone_mouseMX0;
  if(tag >= 50){
    if(this.phone_mouseMIndex > 0){
      this.phone_mouseMIndex--;
    }else{
      this.phone_mouseMIndex = 2;
    }
  }
  if(tag <= -50){
    if(this.phone_mouseMIndex < 2){
      this.phone_mouseMIndex++;
    }else{
      this.phone_mouseMIndex = 0;
    }
  }
},