reactjs useState() hook
import React, { useState } from 'react';
function Example() {
// Declare a new state variable, which we'll call "count"
const [count, setCount] = useState(0);
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}react usestate nedir
import { useState, useEffect } from 'react';
function ArkadasDurumu(props) {
const [onlineMi, onlineDurumuAta] = useState(null);
function handleDurumuDegistir(durum) {
onlineDurumuAta(durum.onlineMi);
}
useEffect(() => {
ChatAPI.arkadasDurumunaAboneOl(props.arkadas.id, handleDurumuDegistir);
return () => {
ChatAPI.arkadasDurumuAboneligindenCik(props.arkadas.id, handleDurumuDegistir);
};
});
if (onlineMi === null) {
return 'Yükleniyor...';
}
return onlineMi ? 'Online' : 'Offline';
}Copyright © 2021 Codeinu
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