React注册倒计时功能的实现

  constructor(props){
    super(props);
    this.state = {
      btnText:'获取验证码',
      seconds: 60, //称数初始化
      liked: true //获取验证码文案
    }
  }

  // 获取验证码
  sendCode = () => {
    let siv = setInterval(() => {
      this.setState({
        liked:false,
        seconds:this.state.seconds - 1,  
      },() => {
        if(this.state.secOnds== 0){
          clearInterval(siv);
          this.setState({
            liked:true,
            secounds:60
          })
        }
      });  
    },1000);  
  }

      
       
        
         {getFieldDecorator('captcha', {
          rules: [{ required: true, message: '请输入短信验证码!' }],
         })(
          
         )}
        
        
          
          {
            this.state.liked
            &＃63;
             {this.state.btnText}
             :
             {this.state.seconds + ' s 后重新发送'}
          }
          
        
       
      

import React, { Component } from 'react'
import axios from 'axios'

export default class Timer extends Component {

 constructor(props) {
  super(props)
  this.state = {
   bool: false,
   days: '0',
   hours: '00',
   minutes: '00',
   seconds: '00'
  }
 }

 componentDidMount() {
  this.start()
 }

 async start() {
  this.timer && clearTimeout(this.timer) // 先清除一遍定时器，避免被调用多次
  // 发起任意一个服务器请求， 然后从headers 里获取服务器时间
  let leftTime = await axios.get('/').then(respOnse=> {
   return new Date(this.props.date).getTime() - new Date(response.headers.date).getTime() // 服务器与倒计时的 时间差
  }).catch(error => {
   console.log(error)
   return 0 // 这里发送的服务器请求失败 设为0
  })

  // 倒计时
  this.timer = setInterval(() => {
   leftTime = leftTime - 1000
   let { bool, days = '0', hours = '00', minutes = '00', secOnds= '00' } = this.countdown(leftTime)
   if (bool) { // 结束倒计时
    clearTimeout(this.timer)
   }
   this.setState({
    bool,
    days,
    hours,
    minutes,
    seconds
   })
  }, 1000)
 }

 /**
  * 倒计时
  * @param leftTime 要倒计时的时间戳
  */
 countdown(leftTime) {
  let bool = false
  if (leftTime <= 0) {
   bool = true
   return { bool }
  }
  var days = parseInt(leftTime / 1000 / 60 / 60 / 24, 10) //计算剩余的天数
  var hours = parseInt(leftTime / 1000 / 60 / 60 % 24, 10)
  if (hours <10) {
   hours = '0' + hours
  }
  var minutes = parseInt(leftTime / 1000 / 60 % 60, 10)
  if (minutes <10) {
   minutes = '0' + minutes
  }
  var secOnds= parseInt(leftTime / 1000 % 60, 10)
  if (seconds <10) {
   secOnds= '0' + seconds
  }
  return { bool, days, hours, minutes, seconds }
 }

 componentWillUnmount() {
  clearTimeout(this.timer)
 }

 render() {
  let { bool, days, hours, minutes, seconds } = this.state
  return (
   

    {
     bool &＃63;
      
活动已结束
 :
      

       {days} 天 {hours} : {minutes} : {seconds}
      
    }
   
  )
 }
}