44 lines
905 B
JavaScript
44 lines
905 B
JavaScript
import React, { useState, useEffect } from 'react';
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import { ArrowUp } from 'lucide-react';
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import './ScrollToTop.css';
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const ScrollToTop = ({ showAfter = 300 }) => {
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const [showButton, setShowButton] = useState(false);
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useEffect(() => {
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const handleScroll = () => {
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if (window.pageYOffset > showAfter) {
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setShowButton(true);
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} else {
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setShowButton(false);
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}
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};
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window.addEventListener('scroll', handleScroll);
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return () => window.removeEventListener('scroll', handleScroll);
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}, [showAfter]);
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const scrollToTop = () => {
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window.scrollTo({
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top: 0,
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behavior: 'smooth'
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});
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};
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if (!showButton) {
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return null;
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}
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return (
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<button
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className="scroll-to-top-btn"
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onClick={scrollToTop}
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aria-label="回到顶部"
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>
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<ArrowUp size={28} />
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</button>
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);
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};
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export default ScrollToTop;
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