React 中的 clearInterval [英] clearInterval in React

问题描述

我是 React 的新手，我试图创建一个带有开始和停止按钮的简单秒表.我正用头撞墙，试图用停止按钮上的 onClick 事件清除间隔.我会为 setInterval 声明一个变量，然后使用 clearInterval 清除它.不幸的是它不起作用.有小费吗?提前致谢.

import React, { Component } from 'react';类 App 扩展组件 {构造函数(道具){超级(道具)；this.state = {time:0}this.startHandler = this.startHandler.bind(this);}获取秒(时间){返回`0${time%60}`.slice(-2);}获取分钟(时间){返回 Math.floor(time/60);}开始处理程序(){setInterval(()=>{this.setState({time:this.state.time + 1});},1000)}停止处理程序(){//如何在这里清除间隔????}使成为 () {返回 (<div><h1>{this.getMinutes(this.state.time)}:{this.getSeconds(this.state.time)}</h1><button onClick = {this.startHandler}>START</button><button onClick = {this.stopHandler}>STOP</button><按钮>重置</按钮>

);}}导出默认应用程序；

解决方案

您可以为组件的状态添加间隔，并且可以随时清除它.

componentDidMount(){让 intervalId = setInterval(this.yourFunction, 1000)this.setState({ intervalId: intervalId })}componentWillUnmount(){clearInterval(this.state.intervalId)}

I'm new at React and I was trying to create a simple stopwatch with a start and stop buttons. I'm banging my head against the wall to try to clearInterval with an onClick event on Stop button. I would declare a variable for the setInterval and then would clear it using the clearInterval. Unfortunately it is not working. Any tips? Thank you in advance.

import React, { Component } from 'react';

class App extends Component {
  constructor(props){
    super(props);
    this.state = {time:0}

    this.startHandler = this.startHandler.bind(this);
  }

  getSeconds(time){
    return `0${time%60}`.slice(-2);
  }

  getMinutes(time){
    return Math.floor(time/60);
  }

  startHandler() {
      setInterval(()=>{
      this.setState({time:this.state.time + 1});
    },1000)

  }

  stopHandler() {
    //HOW TO CLEAR INTERVAL HERE????
  }

  render () {
    return (
      <div>
        <h1>{this.getMinutes(this.state.time)}:{this.getSeconds(this.state.time)}</h1>
        <button onClick = {this.startHandler}>START</button>
        <button onClick = {this.stopHandler}>STOP</button>
        <button>RESET</button>
      </div>
    );
  }
}

export default App;

解决方案

you can add interval to your component's state and can clear it whenever you want.

componentDidMount(){
  let intervalId = setInterval(this.yourFunction, 1000)
  this.setState({ intervalId: intervalId })
}

componentWillUnmount(){
  clearInterval(this.state.intervalId)
}

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