谢谢loelsonk，我做到了

const [dataAction, setDataAction] = useState({name: '', description: ''}); const _handleChangeName = (data) => { if(data.name) setDataAction( prevState => ({ ...prevState, name : data.name })); if(data.description) setDataAction( prevState => ({ ...prevState, description : data.description })); }; ....return ( <input onChange={(event) => _handleChangeName({name: event.target.value})}/> <input onChange={(event) => _handleChangeName({description: event.target.value})}/> )

谢谢loelsonk，我做到了

const [dataAction, setDataAction] = useState({name: '', description: ''}); const _handleChangeName = (data) => { if(data.name) setDataAction( prevState => ({ ...prevState, name : data.name })); if(data.description) setDataAction( prevState => ({ ...prevState, description : data.description })); }; ....return ( <input onChange={(event) => _handleChangeName({name: event.target.value})}/> <input onChange={(event) => _handleChangeName({description: event.target.value})}/> )

钩子是React v16.7.0 alpha中的一个新特性，useState是“钩子”。useState()设置任意变量的默认值，并在函数组件(PureComponent函数)中进行管理。ex: const [count, setCount] = useState(0);设置默认值count 0。你可以使用setCount来增加或减少这个值。onClick={() => setCount(count + 1)}增加计数值

上面提供的答案很好，但让我插一句，useState是异步的，所以如果你的下一个状态依赖于你的前一个状态，你最好给useState一个回调。请看下面的例子:

import { useState } from 'react';

function Example() {
    const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      // passing a callback to useState to update count
      <button onClick={() => setCount(count => count + 1)}>
        Click me
      </button>
    </div>
  );
}

如果您的新状态依赖于旧状态的计算，这是推荐的方法。

基本上React.useState(0)神奇地看到它应该返回元组计数和setCount(一个改变计数的方法)。参数useState用于设置count的初始值。

  const [count, setCount] = React.useState(0);
  const [count2, setCount2] = React.useState(0);

  // increments count by 1 when first button clicked
  function handleClick(){
    setCount(count + 1);
  } 

  // increments count2 by 1 when second button clicked
  function handleClick2(){
    setCount2(count2 + 1);
  } 

  return (
    <div>
      <h2>A React counter made with the useState Hook!</h2>
      <p>You clicked {count} times</p>
      <p>You clicked {count2} times</p>
      <button onClick={handleClick}>
        Click me
      </button> 
      <button onClick={handleClick2}>
        Click me2
      </button>
  );

基于Enmanuel Duran的示例，但显示了两个计数器，并将lambda函数作为普通函数编写，因此有些人可能更容易理解。

useState钩子的语法很简单。

const [value, setValue] = useState(defaultValue)

如果您不熟悉这个语法，请到这里。

我建议您阅读文档。有很好的解释和大量的例子。

import { useState } from 'react'; function Example() { // Declare a new state variable, which we'll call "count" const [count, setCount] = useState(0); // its up to you how you do it const buttonClickHandler = e => { // increment // setCount(count + 1) // decrement // setCount(count -1) // anything // setCount(0) } return ( <div> <p>You clicked {count} times</p> <button onClick={buttonClickHandler}> Click me </button> </div> ); }