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15-effect-deps.html
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15-effect-deps.html
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<body>
<div id="root"></div>
<script src="https://unpkg.com/[email protected]/umd/react.development.js"></script>
<script src="https://unpkg.com/[email protected]/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/@babel/[email protected]/babel.js"></script>
<script type="text/babel">
function Greeting() {
const [name, setName] = React.useState(
() => window.localStorage.getItem('name') || '',
)
React.useEffect(() => {
window.localStorage.setItem('name', name)
}, [name])
const handleChange = event => setName(event.target.value)
return (
<div>
<form>
<label htmlFor="name">Name: </label>
<input value={name} onChange={handleChange} id="name" />
</form>
{name ? <strong>Hello {name}</strong> : 'Please type your name'}
</div>
)
}
function App() {
const [count, setCount] = React.useState(0)
return (
<>
<button onClick={() => setCount(c => c + 1)}>{count}</button>
<Greeting />
</>
)
}
ReactDOM.render(<App />, document.getElementById('root'))
</script>
</body>