1*9677305bS猫头猫import {useRef, useState, useEffect, useCallback} from 'react'; 2*9677305bS猫头猫 3*9677305bS猫头猫export function useOnMounted() { 4*9677305bS猫头猫 const onMounted = useRef(false); 5*9677305bS猫头猫 const [isLoading, setLoading] = useState(true); 6*9677305bS猫头猫 7*9677305bS猫头猫 useEffect(() => { 8*9677305bS猫头猫 onMounted.current = true; 9*9677305bS猫头猫 setTimeout(() => { 10*9677305bS猫头猫 setLoading(false); 11*9677305bS猫头猫 }); 12*9677305bS猫头猫 13*9677305bS猫头猫 return () => { 14*9677305bS猫头猫 onMounted.current = false; 15*9677305bS猫头猫 }; 16*9677305bS猫头猫 }, []); 17*9677305bS猫头猫 18*9677305bS猫头猫 return {onMounted: useCallback(() => onMounted.current, []), isLoading}; 19*9677305bS猫头猫} 20