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並前往https://johnnn.tech/q/why-useref-can-be-used-to-store-the-setinterval-reference-in-react-but-not-a-normal-variable/

Why useRef can be used to store the setInterval ... - Johnnn.tech

const ref=useRef(0);. 6. //let hold=0;. 7. const countdown=()=>{. 8. ref.current=setInterval(()=>{. 9. // console.log('ref.current-->',ref.current);.

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