uniapp的自定义组件component如何实现滑到底部自动加载更多和下拉刷新？

组件最外层增加一个scroll-view，增加scrolltoupper及scrolltolower事件监听，下拉刷新就需要增加 refresher-enabled="true"

<scroll-view :scroll-top="scrollTop" scroll-y="true" class="scroll-Y" @scrolltoupper="upper"
					@scrolltolower="lower" @scroll="scroll" refresher-enabled="true" :refresher-triggered="triggered"
			:refresher-threshold="100" refresher-background="lightgreen" @refresherpulling="onPulling"
			@refresherrefresh="onRefresh" @refresherrestore="onRestore" @refresherabort="onAbort">
					<view id="demo1" class="scroll-view-item uni-bg-red">A</view>
					<view id="demo2" class="scroll-view-item uni-bg-green">B</view>
					<view id="demo3" class="scroll-view-item uni-bg-blue">C</view>
</scroll-view>

<template>
	<view>

		
		<scroll-view style="height: 300px;" scroll-y="true" refresher-enabled="true" :refresher-triggered="triggered"
			:refresher-threshold="100" refresher-background="lightgreen" @refresherpulling="onPulling"
			@refresherrefresh="onRefresh" @refresherrestore="onRestore" @refresherabort="onAbort"></scroll-view>

		<!-- 本示例未包含完整css，获取外链css请参考上文，在hello uni-app项目中查看 -->

		<view class="uni-padding-wrap uni-common-mt">
			<view class="uni-title uni-common-mt">
				Vertical Scroll
				<text>\n纵向滚动</text>
			</view>
			<view>
				<scroll-view :scroll-top="scrollTop" s...

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