React注册倒计时功能的实现

一、React版本

16.4.1

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('/').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>  ) }}