如何使用Vue实现下拉刷新特效

<template>  <div class="pull-refresh"       @touchstart="handleTouchStart"       @touchmove="handleTouchMove"       @touchend="handleTouchEnd">    <div class="pull-refresh-content">       <!-- 数据展示区域 -->    </div>    <div class="pull-refresh-indicator" v-show="showIndicator">      <span class="arrow" :class="indicatorClass"></span>      <span class="text">{{ indicatorText }}</span>    </div>  </div></template><script>export default {  data() {    return {      startY: 0, // 记录用户手指触摸屏幕的纵坐标      distanceY: 0, // 记录用户手指拖动的距离      showIndicator: false, // 是否显示下拉刷新指示器      indicatorText: '', // 指示器文本      loading: false // 是否正在加载数据    }  },  methods: {    handleTouchStart(event) {      this.startY = event.touches[0].clientY    },    handleTouchMove(event) {      if (window.pageYOffset === 0 && this.startY < event.touches[0].clientY) {        // 说明用户是在页面顶部进行下拉操作        event.preventDefault()        this.distanceY = event.touches[0].clientY - this.startY        this.showIndicator = this.distanceY >= 60        this.indicatorText = this.distanceY >= 60 ? '释放刷新' : '下拉刷新'      }    },    handleTouchEnd() {      if (this.showIndicator) {        // 用户松开手指，开始刷新数据        this.loading = true        // 这里可以调用数据接口，获取最新的数据        setTimeout(() => {          // 模拟获取数据的延迟          this.loading = false          this.showIndicator = false          this.indicatorText = ''          // 数据更新完成，重新渲染页面        }, 2000)      }    }  },  computed: {    indicatorClass() {      return {        'arrow-down': !this.loading && !this.showIndicator,        'arrow-up': !this.loading && this.showIndicator,        'loading': this.loading      }    }  }}</script><style scoped>.pull-refresh {  position: relative;  width: 100%;  height: 100%;  overflow-y: scroll;}.pull-refresh-content {  width: 100%;  height: 100%;}.pull-refresh-indicator {  position: absolute;  top: -60px;  left: 0;  width: 100%;  height: 60px;  text-align: center;  line-height: 60px;}.pull-refresh-indicator .arrow {  display: inline-block;  width: 14px;  height: 16px;  background: url(arrow.png);  background-position: -14px 0;  background-repeat: no-repeat;  transform: rotate(-180deg);  transition: transform 0.3s;}.pull-refresh-indicator .arrow-up {  transform: rotate(0deg);}.pull-refresh-indicator .loading {  background: url(loading.gif) center center no-repeat;}</style>