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30 lines
1016 B
JavaScript
30 lines
1016 B
JavaScript
import React, { useEffect, useState } from 'react'
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import throttle from 'lodash.throttle'
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/**
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* 跳转到网页顶部；当屏幕下滑500像素后会出现该控件
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* @returns {JSX.Element}
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* @constructor
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*/
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const Progress = ({ targetRef }) => {
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const [percent, changePercent] = useState(0)
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useEffect(() => {
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const scrollListener = throttle(() => {
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if (targetRef.current) {
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const fullHeight = targetRef.current.clientHeight
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const per = parseFloat(((window.scrollY / (fullHeight - 100) * 100)).toFixed(0))
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changePercent(per)
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}
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// console.log('滚动信息', window.scrollY, fullHeight, per)
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}, 1)
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document.addEventListener('scroll', scrollListener)
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return () => document.removeEventListener('scroll', scrollListener)
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}, [percent])
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return (<div className='h-1.5 fixed top-0 w-full shadow-2xl z-40'>
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<div className='h-1 bg-blue-500 fixed top-0 w-1 duration-200' style={{ width: `${percent}%` }}/>
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</div>)
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}
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export default Progress
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