二、具体代码如下
设置state属性
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 } }
2.倒计时
// 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); }
3.jsx代码
<FormItem {...formItemLayout} label="验证码" > <Row gutter={8}> <Col span={6}> {getFieldDecorator('captcha', { rules: [{ required: true, message: '请输入短信验证码!' }], })( <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 后重新发送'}</span> } </Button> </Col> </Row> </FormItem>
明明很简单的，但是看网上有的代码搞得很复杂一样，当然也可以用react相关插件，不过我觉得这样更简洁。
ps：react 获取服务器端时间倒计时
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('https://www.jb51.net/').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 ( <div> { bool ? <div>活动已结束</div> : <div> {days} 天 {hours} : {minutes} : {seconds} </div> } </div> ) } }