我使用的方法是这样的:

import { ChangeEvent, useState } from 'react';


export const InputChange = () => {
  const [state, setState] = useState({ value: '' });

  const handleChange = (event: ChangeEvent<{ value: string }>) => {
    setState({ value: event?.currentTarget?.value });
  }
  return (
    <div>
      <input onChange={handleChange} />
      <p>{state?.value}</p>
    </div>
  );
}

在TypeScript中使用的正确方法是

  handleChange(e: React.ChangeEvent<HTMLInputElement>) {
    // No longer need to cast to any - hooray for react!
    this.setState({temperature: e.target.value});
  }

  render() {
        ...
        <input value={temperature} onChange={this.handleChange} />
        ...
    );
  }

遵循完整的类，更好地理解:

import * as React from "react";

const scaleNames = {
  c: 'Celsius',
  f: 'Fahrenheit'
};


interface TemperatureState {
   temperature: string;
}

interface TemperatureProps {
   scale: string;

}

class TemperatureInput extends React.Component<TemperatureProps, TemperatureState> {
  constructor(props: TemperatureProps) {
    super(props);
    this.handleChange = this.handleChange.bind(this);
    this.state = {temperature: ''};
  }

  //  handleChange(e: { target: { value: string; }; }) {
  //    this.setState({temperature: e.target.value});  
  //  }


  handleChange(e: React.ChangeEvent<HTMLInputElement>) {
    // No longer need to cast to any - hooray for react!
    this.setState({temperature: e.target.value});
  }

  render() {
    const temperature = this.state.temperature;
    const scale = this.props.scale;
    return (
      <fieldset>
        <legend>Enter temperature in {scaleNames[scale]}:</legend>
        <input value={temperature} onChange={this.handleChange} />
      </fieldset>
    );
  }
}

export default TemperatureInput;

>是typescript中更改事件的类型。事情是这样的

import { ChangeEvent } from 'react';

const handleInputChange = (event: ChangeEvent<HTMLInputElement>) => {
    setValue(event.target.value);
};

一般情况下，事件处理程序应该使用e. currentarget。值,例如:

const onChange = (e: React.FormEvent<HTMLInputElement>) => {
  const newValue = e.currentTarget.value;
}

你可以在这里读到为什么会这样(还原“Make SyntheticEvent。target generic，而不是syntheticevent . currentarget .")。

UPD:正如@roger-gusmao提到的，ChangeEvent更适合输入表单事件。

const onChange = (e: React.ChangeEvent<HTMLInputElement>) => {
  const newValue = e.target.value;
}

这是当你使用FileList对象的时候:

onChange={(event: React.ChangeEvent<HTMLInputElement>): void => {
  const fileListObj: FileList | null = event.target.files;
  if (Object.keys(fileListObj as Object).length > 3) {
    alert('Only three images pleaseeeee :)');
  } else {
    // Do something
  }

  return;
}}

我们还可以使用onChange事件触发定义的类型(在函数组件中)，如下所示:

 const handleChange = (
    e: React.ChangeEvent<HTMLTextAreaElement | HTMLInputElement>
  ) => {
        const name = e.target.name;
        const value = e.target.value;
};