3 回答

TA貢獻1869條經驗 獲得超4個贊
我認為react-dom沒有useState,所以將文件的頂部更改為:
import React, { useState } from "react"
import './App.css';
function App(props) {
const [click, setClick] = useState(0);
const handleChange = e => {
console.log(e.target.value)
}
const handleClick = e => {
console.log(e.target)
}
return (
<div className="App">
Value<input type="text" onChange={ handleChange }/>
<select>
<option>F to C degrees</option>
<option>C to F degrees</option>
</select>
<button onClick={handleClick}>Go</button>
</div>
);
}
export default App;

TA貢獻1829條經驗 獲得超13個贊
import React from "react"
const App = (props)=>{
const [click, setClick] = useState(0);
const handleChange = e => {
console.log(e.target.value)
}
const handleClick = e => {
console.log(e.target)
}
return (
<div className="App">
Value<input type="text" onChange={ handleChange }/>
<select>
<option>F to C degrees</option>
<option>C to F degrees</option>
</select>
<button onClick={handleClick}>Go</button>
</div>
);
}
export default App;
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