perf: 已读状态: 不在当前页面时不更新
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import { useState, useEffect } from 'react';
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export function useVisibilityState() {
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const [isVisible, setIsVisible] = useState(true);
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useEffect(() => {
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const handleVisibilityChange = () => {
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setIsVisible(document.visibilityState === 'visible');
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};
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document.addEventListener('visibilitychange', handleVisibilityChange);
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handleVisibilityChange(); // Initial check on component mount
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return () => {
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document.removeEventListener('visibilitychange', handleVisibilityChange);
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};
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}, []);
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return isVisible;
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}
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