vue 手机触屏滑动

功能：iview Carousel 走马灯，我需要在phone上实现滑动切换功能。

data() {
return {
  phone_mouseMIndex: 0, // phone端 滑动索引
  phone_mouseMX0: 0, // phone端 滑动索引
  phone_mouseMX1: 0, // phone端 滑动索引
}
},
...
// phone端 滑动开始
phone_mouseS(e){
  this.phone_mouseMX0 = e.changedTouches[0].pageX;
},
// phone端 滑动结束
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;
    }
  }
},