constructor(props){    super(props);    this.state = {      btnText:'獲取驗證碼',      seconds: 60, //稱數初始化      liked: true //獲取驗證碼文案    }  }

  // 獲取驗證碼  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);    }

      <FormItem       {...formItemLayout}       label="驗證碼"      >       <Row gutter={8}>        <Col span={6}>         {getFieldDecorator('captcha', {          rules: [{ required: true, message: '請輸入短信驗證碼!' }],         })(          <Input />         )}        </Col>        <Col span={12}>          <Button onClick={this.sendCode} disabled={!this.state.liked}>          {            this.state.liked            ?             <span>{this.state.btnText}</span>             :             <span>{this.state.seconds + ' s 后重新發送'}</span>          }          </Button>        </Col>       </Row>      </FormItem>

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) // 先清除一遍定時器，避免被調用多次  // 發起任意一個服務器請求， 然后從headers 里獲取服務器時間  let leftTime = await axios.get('/').then(response => {   return new Date(this.props.date).getTime() - new Date(response.headers.date).getTime() // 服務器與倒計時的 時間差  }).catch(error => {   console.log(error)   return 0 // 這里發送的服務器請求失敗 設為0  })  // 倒計時  this.timer = setInterval(() => {   leftTime = leftTime - 1000   let { bool, days = '0', hours = '00', minutes = '00', seconds = '00' } = this.countdown(leftTime)   if (bool) { // 結束倒計時    clearTimeout(this.timer)   }   this.setState({    bool,    days,    hours,    minutes,    seconds   })  }, 1000) } /**  * 倒計時  * @param leftTime 要倒計時的時間戳  */ countdown(leftTime) {  let bool = false  if (leftTime <= 0) {   bool = true   return { bool }  }  var days = parseInt(leftTime / 1000 / 60 / 60 / 24, 10) //計算剩余的天數  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 (   <div>    {     bool ?      <div>活動已結束</div> :      <div>       {days} 天 {hours} : {minutes} : {seconds}      </div>    }   </div>  ) }}