import React, { useState } from 'react'


const [rememberUser, setRememberUser] = useState(true) //use false for unchecked initially


<input
   type="checkbox"
   checked={rememberUser}
   onChange={() => {
      setRememberUser(!rememberUser)
   }}
/>

我尝试使用Class组件来实现这一点: 您可以查看相同的消息

…

class Checkbox extends React.Component{
constructor(props){
    super(props)
    this.state={
        checked:true
    }
    this.handleCheck=this.handleCheck.bind(this)
}

handleCheck(){
    this.setState({
        checked:!this.state.checked
    })
}

render(){
    var msg=" "
    if(this.state.checked){
        msg="checked!"
    }else{
        msg="not checked!"
    }
    return(
        <div>
            <input type="checkbox" 
            onChange={this.handleCheck}
            defaultChecked={this.state.checked}
            />
            <p>this box is {msg}</p>
        </div>
    )
}

}

Don't make it too hard. First, understand a simple example given below. It will be clear to you. In this case, just after pressing the checkbox, we will grab the value from the state(initially it's false), change it to other value(initially it's true) & set the state accordingly. If the checkbox is pressed for the second time, it will do the same process again. Grabbing the value (now it's true), change it(to false) & then set the state accordingly(now it's false again. The code is shared below.

第1部分

state = {
  verified: false
} // The verified state is now false

第2部分

verifiedChange = e => {
  // e.preventDefault(); It's not needed
  const { verified } = e.target;
  this.setState({
    verified: !this.state.verified // It will make the default state value(false) at Part 1 to true 
  });
}; 

第3部分

  <form> 
      <input
          type="checkbox"
          name="verified"
          id="verified"
          onChange={this.verifiedChange} // Triggers the function in the Part 2
          value={this.state.verified}
      />
      <label for="verified">
      <small>Verified</small>
      </label>
  </form>

这是我前段时间写的代码，可能有用。 你要用这条线=> this。State = {checked: false, checke2: true};

class Componente extends React.Component {
  constructor(props) {
    super(props);

    this.state = { checked: false, checked2: true};
    this.handleChange = this.handleChange.bind(this);
    this.handleChange2 = this.handleChange2.bind(this);

  }  

  handleChange() {
    this.setState({
        checked: !this.state.checked      
    })
  }

  handleChange2() {
    this.setState({
        checked2: !this.state.checked2      
    })
  }

  render() {
    const togglecheck1 = this.state.checked ? 'hidden-check1' : '';
    const togglecheck2 = this.state.checked2 ? 'hidden-check2' : '';

    return <div>
        <div>
        <label>Check 1</label>
        <input type="checkbox" id="chk1"className="chk11" checked={ this.state.checked } onChange={ this.handleChange } />
        <label>Check 2</label>
        <input type="checkbox" id="chk2" className="chk22" checked={ this.state.checked2 } onChange={ this.handleChange2 } />
      </div>

      <div className={ togglecheck1 }>show hide div with check 1</div>
      <div className={ togglecheck2 }>show hide div with check 2</div>

    </div>;
  }
}

ReactDOM.render(
  <Componente />,
  document.getElementById('container')
);

CSS

.hidden-check1 {
  display: none;  
  }

.hidden-check2 {
  visibility: hidden;
}

HTML

  <div id="container">
      <!-- This element's contents will be replaced with your component. -->
  </div>

这是codepen => http://codepen.io/parlop/pen/EKmaWM

我将状态设置为任何[]类型。并在构造函数中将状态设置为null。

onServiceChange = (e) => {
    const {value} = e.target;
    const index = this.state.services.indexOf(value);
    const services = this.state.services.filter(item => item !== value);
    this.setState(prevState => ({
        services: index === -1 ? prevState.services.push(value) && prevState.services : this.state.services.filter(item => item !== value)
    }))
}

在输入元素中

this.onServiceChange (e)} / > this.onServiceChange (e)} / > this.onServiceChange (e)} / > this.onServiceChange (e)} / >

过了一段时间我才明白。我想这可能对你们都有帮助。

如果该复选框仅与React一起创建。createElement然后属性 使用defaultChecked。

React.createElement('input',{type: 'checkbox', defaultChecked: false});

归功于@nash_ag