跨组件发送多个道具 React

Question

我正在尝试将两个变量从组件 'Game' 发送到组件 'App' 但我不确定如何一次发送多个道具。

这是我拥有的：

//App Component

class App extends Component {

  constructor(props) {
    super(props)
    this.state = {
      score: 0,
    }

    this.changeScore = this.changeScore.bind(this)
  }

  changeScore(newScore) {
    this.setState(prevState => ({
      score: prevState.score + newScore
    }))
  }

  render() {
    return(
      <div>
        <Game onClick={this.changeScore}/>
        <Score score={this.state.score}/>
      </div>
    )
  }
}

//Game Componenet 

class Game extends Component {

    constructor(props) {
        super(props)
        this.state = {
            score: 0,
        }
        this.handleClick = this.handleClick.bind(this)
    }

    handleClick() {
        console.log('Clicked')
        this.props.onClick(this.state.score)

    }

    render() {
        return(
            <div>
                <button onClick={this.handleClick}> Score Button </button>
            </div>
        )
    }
}

//Score Component

class Score extends Component {


    render() {

        const score = this.props.score

        return(
            <div>
                <h1>Score: {score}</h1>
            </div>
        )
    }
}

有了这个，我可以将道具 'score' 从 'Game' 发送到 'App'，但我想知道是否可以发送比一个道具更多的道具，例如'score' 和一个新变量 'count' 按下相同的按钮，最终能够在 'Score' Componenet 中同时显示 'score' 和 'count'。

谢谢。

Answer 1

当然可以，只需更新您在 Parent App 组件中定义的函数以接受两个参数。

App.js

class App extends Component {

  constructor(props) {
    super(props)
    this.state = {
      score: 0,
      count: 0
    }

    this.changeScore = this.changeScore.bind(this)
  }

  changeScore(newScore, count) {
    this.setState(prevState => ({
      score: prevState.score + newScore,
      count: prevState.count + count
    }))
  }

  render() {
    return(
      <div>
        <Game 
           onClick={this.changeScore} 
           score={this.state.score} 
           count={this.state.count}
        />
        <Score score={this.state.score} count={this.state.count}/>
      </div>
    )
  }
}

Game.js //重构因为它不需要使用状态

const Game = ({ onClick, count, score }) => {
   const newScore = score + 10
   const newCount = count + 1
   return (
       <button onClick={() => onClick(newScore, newCount)}>Score</button>
   )
}

Answer 2

一次绝对可以发送多个道具。这是您描述的示例：

<Score
    score={this.state.score}
    count={this.state.count}
/>

在你的分数组件中：

class Score extends Component {


    render() {

        const score = this.props.score;
        const count = this.props.count;

        return(
            <div>
                <h1>Score: {score}</h1>
                <h1>Count: {count}</h1>
            </div>
        )
    }
}

跨组件发送多个道具 React

Send multiple props across components React

javascript

reactjs

components

react-props

react-state