如何封装了一个vue移动端下拉加载下一页数据的组件

<template>
 <div class="my-scroll" :class="[scrollState?'prohibit':'allow']" ref="myScroll" @scroll.passive="onScroll($event)" @touchmove="onScroll($event)" >
 <!-- top -->
 <div class="scroll-list">
 <slot name='scrollList'></slot>
 <div class="scroll-bottom">
 <div v-if="state==1">
 <i><img :src="Load"/></i>
 <p>加载中</p>
 </div>
 <div v-if="state==2">加载完成</div>
 <div v-if="state==3">没有数据了</div>
 </div>
 </div>
 </div>
</template>
<script type="text/javascript">
import Load from '@/assets/Load.gif'
export default {
 name: 'myScroll',
 props: {
 'onPull': { // 加载回调
 type: Function,
 require: true
 },
 'scrollState': {// 是否可滑动
 type: Boolean,
 require: true
 },
 loaded: {
 type: Boolean,
 default() {
 return false
 }
 }
 },
 data() {
 return {
 Load,
 timeoutId: null,
 state: 0,
 myScroll: null
 }
 },
 methods: {
 /*
 * 加载中：1
 * 加载完成：2
 * 没有更多：3
 */
 setState(index) { // 修改状态
 this.state = index
 // console.log(this.state)
 },
 onScroll(e) {
 const _this = this
 const scrollTop = document.documentElement.scrollTop || document.body.scrollTop
 // console.log(window.innerHeight + scrollTop, this.myScroll.offsetHeight)
 if (!this.loaded && window.innerHeight + scrollTop - 50 >= this.myScroll.offsetHeight) {
 clearTimeout(this.timeoutId)
 _this.timeoutId = setTimeout(() => {
 _this.bottomCallback()
 }, 100)
 }
 },
 bottomCallback() { // 加载回调
 // console.log('回调', new Date().getTime())
 if (this.state != 3) {
 this.state = 1
 this.onPull()
 }
 }
 },
 mounted() {
 this.myScroll = this.$refs.myScroll // 获取滑条dom
 }
}
</script>
<style lang="scss" scoped>
 .allow{
 overflow:hidden;
 height: auto;
 }
 .prohibit{
 max-width: 100%;
 max-height: 100%;
 height: 100%;
 overflow:hidden;
 overflow-y: scroll;
 -webkit-overflow-scrolling: touch;
 will-change: transform;
 transition: all 450ms;
 backface-visibility: hidden;
 perspective: 1000;
 }
 .my-scroll{
 position: relative;
 color: #999;
 .scroll-top{
 text-align: center;
 display:flex;
 position:absolute;
 top:0;
 left:0;
 width:100%;
 overflow: hidden;
 }
 .scroll-list{
 overflow:hidden;
 min-height: 100%;
 }
 .scroll-bottom{
 text-align: center;
 line-height: .8rem;
 div{
 display:flex;
 height:auto;
 width:100%;
 justify-content: center;
 align-items:center;
 flex-wrap: wrap;
 i{
 flex:1 0 100%;
 display:block;
 height: 0.4rem;
 }
 img{
 width:0.6rem;
 }
 p{
 flex:1 0 100%;
 }
 }
 }
 }
</style>

<template>
 <div id="app">
 <my-scroll class="scrolls" ref="myScroll" :on-pull="getList" :loaded="loaded" :scroll-state="scrollState">
 <div slot="scrollList">
 <div class="list" v-for="(item,index) in listData" :key="index">{{item.name}}</div>
 </div>
 </my-scroll>
 </div>
</template>
<script>
import myScroll from "./components/vue-scroll.vue";
import axios from 'axios'
export default {
 name: "app",
 data(){
 return{
 scrollState: true, // 是否可以滑动
 loaded: false,
 iPage: 1,
 listData:[],
 iPageSize: 10,
 }
 },
 methods: {
 getList(){
 this.$refs.myScroll.setState(1)
 let _this = this
 // ajax 请求
 axios.get('https://easy-mock.com/mock/5b90f971ce624c454133ee2d/scoll/datalist').then(function (response) {
 if (response.data.code == 200 && response.data.data.pagelist.length > 0 && !_this.loaded) {
 if (_this.iPage == 1) {
 _this.listData = response.data.data.pagelist
 } else {
 _this.listData.push(...response.data.data.pagelist)
 }
 _this.iPage++
 _this.$refs.myScroll.setState(2)
 } else {
 if (_this.iPage == 1) {
 _this.czListData = []
 }
 _this.loaded = true
 _this.$refs.myScroll.setState(3)
 } 
 })
 .catch(function (error) {
 console.log(error);
 });
 }

 },
 mounted () {
 this.getList() 
 },
 components: {
 myScroll
 }
};
</script>

<style scoped>
#app {
 font-family: "Avenir", Helvetica, Arial, sans-serif;
 -webkit-font-smoothing: antialiased;
 -moz-osx-font-smoothing: grayscale;
 text-align: center;
 color: #2c3e50;
 margin-top: 60px;
}
.scrolls{
 font-size:.24rem;
}
.list{
 height:.9rem;
 line-height: .9rem;
 margin-bottom:.1rem;
 border-bottom:1px solid #dedede;
 color:#999;
 font-size:.28rem;
}
</style>