mounted() {
  ···
  this.dom.addEventListener('scroll', this.scroll, false)
  ···
 },
 beforeDestroy() {
  ···
  this.dom.removeEventListener('scroll', this.scroll, false)
  ···
 },

 /**
  * 滾動(dòng)鉤子
  */
  scroll() {
  const viewHeight = global.innerHeight
  let parentNode
  if (this.container !== global) {
   parentNode = this.$el
  } else {
   parentNode = this.$el.parentNode
  }
  if (parentNode) {
   // 獲取Vue實(shí)例使用的根 DOM 元素相對(duì)于視口的位置
   const rect = parentNode.getBoundingClientRect()
   // this.distance 離底部多少距離開(kāi)始加載
   // 如果此元素底邊距離視口頂部的距離小于視口高度加上distance之和，就加載下一頁(yè)
   if ((rect.bottom <= viewHeight + this.distance) && this.loadable && !this.loading) {
   this.load()
   }
  }
  },

<template>
 <div class="loadmore" ref="loadmore">
 <div class="loadmore__body">
  <slot></slot>
 </div>
 <div class="loadmore__footer">
  <span v-if="loading">
  <i class="tc-loading"></i>
  <span>正在加載</span>
  </span>
  <span v-else-if="loadable">加載更多</span>
  <span v-else>沒(méi)有更多了</span>
 </div>
 </div>
</template>
<script type="text/babel">
 import axios from 'axios'
 const CancelToken = axios.CancelToken
 export default {
 data() {
  return {
  /**
   * 總頁(yè)數(shù)（由服務(wù)端返回）
   * @type {number}
   */
  count: 0,
  /**
   * 是否正在拖拽中
   * @type {boolean}
   */
  dragging: false,
  /**
   * 已加載次數(shù)
   * @type {number}
   */
  times: 0,
  /**
   * 已開(kāi)始記載
   * @type {boolean}
   */
  started: false,
  /**
   * 正在加載中
   * @type {boolean}
   */
  loading: false,
  dom: null,
  }
 },
 props: {
  /**
  * 初始化后自動(dòng)開(kāi)始加載數(shù)據(jù)
  */
  autoload: {
  type: Boolean,
  default: true,
  },
  /**
  * 離組件最近的可滾動(dòng)父級(jí)元素（用于監(jiān)聽(tīng)事件及獲取滾動(dòng)條位置）
  */
  container: {
  // Selector or Element
  default: () => (global),
  },
  /**
  * Axios請(qǐng)求參數(shù)配置對(duì)象
  * {@link https://github.com/mzabriskie/axios#request-config}
  */
  options: {
  type: Object,
  default: null,
  },
  /**
  * 起始頁(yè)碼
  */
  page: {
  type: Number,
  default: 1,
  },
  /**
  * 每頁(yè)加載數(shù)據(jù)條數(shù)
  */
  rows: {
  type: Number,
  default: 10,
  },
  /**
  * 數(shù)據(jù)加載請(qǐng)求地址
  */
  url: {
  type: String,
  default: '',
  },
  /**
  * 距離底部多遠(yuǎn)加載
  */
  distance: {
  type: Number,
  default: 200,
  },
 },
 computed: {
  /**
  * 是否可以加載
  * @returns {boolean} 是與否
  */
  loadable() {
  return !this.started || (this.page + this.times) <= this.count
  },
 },
 mounted() {
  if (this.container !== global) {
  this.dom = document.querySelector(this.container)
  } else {
  this.dom = this.container
  }
  if (!this.dom) {
  return
  }
  this.dom.addEventListener('scroll', this.scroll, false)
  if (this.autoload && !this.loading) {
  this.load()
  }
 },
 // eslint-disable-next-line
 beforeDestroy() {
  if (this.dom) {
  this.dom.removeEventListener('scroll', this.scroll, false)
  }
 },
 methods: {
  /**
  * 滾動(dòng)鉤子
  */
  scroll() {
  const viewHeight = global.innerHeight
  let parentNode
  if (this.container !== global) {
   parentNode = this.$el
  } else {
   parentNode = this.$el.parentNode
  }
  if (parentNode) {
   const rect = parentNode.getBoundingClientRect()
   if ((rect.bottom <= viewHeight + this.distance) && this.loadable && !this.loading) {
   this.load()
   }
  }
  },
  /**
  * 加載一組數(shù)據(jù)的方法
  */
  load() {
  if (this.loading) {
   return
  }
  this.started = true
  this.loading = true
  const params = {
   currentPage: this.page + this.times,
   pageSize: this.rows,
  }
  const options = Object.assign({}, this.options, {
   url: this.url,
   cancelToken: new CancelToken((cancel) => {
   this.cancel = cancel
   }),
  })
  if (String(options.method).toUpperCase() === 'POST') {
   options.data = Object.assign({}, options.data, params)
  } else {
   options.params = Object.assign({}, options.params, params)
  }
  this.$axios.request(options).then((res) => {
   const data = res.result
   this.times += 1
   this.loading = false
   this.count = data.pageCount
   this.$emit('success', data.list)
   this.$emit('complete')
  }).catch((e) => {
   this.loading = false
   this.$emit('error', e)
   this.$emit('complete')
  })
  },
  /**
  * 重置加載相關(guān)變量
  */
  reset() {
  this.count = 0
  this.times = 0
  this.started = false
  this.loading = false
  },
  /**
  *重新開(kāi)始加載
  */
  restart() {
  this.reset()
  this.load()
  },
 },
 }
</script>