React-class的setState
import React, {Component} from 'react';
export default class App1 extends Component {
constructor(props) {
super(props);
this.state = {count: 0}
}
render() {
const {count} = this.state
return (
count: {count}
);
}
addCount(){
this.setState({count:this.state.count+1})
}
}
React-hooks-useState
import React, {useState} from 'react'
function App2() {
const [count, addCount] = useState(0)
return (
count: {count}
)
}
export default App2