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背景

在开发过程中，经常需要使用到倒计时的场景，当用户点击后，按钮进行倒计时，然后等待邮件或者短信发送，每次都写重复代码，会让代码显得臃肿，所以封装一个组件来减少耦合

创建一个倒计时组件

编辑基本框架

设计3个参数，一个是倒计时时长，一个是开始时执行的方法，一个是展示文本

import React, { useState, useEffect, useRef } from 'react';
import { Button } from 'antd';// 定义 CountdownButton 的属性接口
interface CountdownButtonProps extends Omit<React.ButtonHTMLAttributes<HTMLButtonElement>, 'onClick'> {countdownTime?: number;text?: string;onStart?: () => void;
}const CountdownButton: React.FC<CountdownButtonProps> = ({ countdownTime = 60, text = '获取验证码', onStart, ...restProps }) => {const [isDisabled, setIsDisabled] = useState(false);const [buttonText, setButtonText] = useState(text);// 使用useRef来保存倒计时的当前值，避免状态重置const countdownRef = useRef(countdownTime);const intervalRef = useRef<number | null>(null);return (<Button >{buttonText}</Button>);
};export default CountdownButton;

实现倒计时方法

实现剩余时间修改方法

    // 使用自定义的setCountdownRef函数来更新倒计时值const setCountdownRef = (update: (current: number) => number) => {const newCountdown = update(countdownRef.current);countdownRef.current = newCountdown;};

实现开启倒计时方法

   const handleStartCountdown = () => {// 立即更新按钮文本和状态setButtonText(`${countdownRef.current}s后重试`);setIsDisabled(true);if (typeof onStart === 'function') {onStart();}// 如果已经有定时器存在，则清除它if (intervalRef.current !== null) {clearInterval(intervalRef.current!);}intervalRef.current = setInterval(() => {setButtonText(`${countdownRef.current}s后重试`);setCountdownRef((prevCountdown) => {if (prevCountdown <= 1) {clearInterval(intervalRef.current!);intervalRef.current = null;setButtonText(text);setIsDisabled(false);return countdownTime; // 重置倒计时时间}return prevCountdown - 1;});}, 1000);

实现清楚定时器方法

    // 清除定时器useEffect(() => {return () => {if (intervalRef.current !== null) {clearInterval(intervalRef.current!);}};}, []);

完整代码

import React, { useState, useEffect, useRef } from 'react';
import { Button } from 'antd';// 定义 CountdownButton 的属性接口
interface CountdownButtonProps extends Omit<React.ButtonHTMLAttributes<HTMLButtonElement>, 'onClick'> {countdownTime?: number;text?: string;onStart?: () => void;
}const CountdownButton: React.FC<CountdownButtonProps> = ({ countdownTime = 60, text = '获取验证码', onStart, ...restProps }) => {const [isDisabled, setIsDisabled] = useState(false);const [buttonText, setButtonText] = useState(text);// 使用useRef来保存倒计时的当前值，避免状态重置const countdownRef = useRef(countdownTime);const intervalRef = useRef<number | null>(null);// 清除定时器useEffect(() => {return () => {if (intervalRef.current !== null) {clearInterval(intervalRef.current!);}};}, []);const handleStartCountdown = () => {// 立即更新按钮文本和状态setButtonText(`${countdownRef.current}s后重试`);setIsDisabled(true);if (typeof onStart === 'function') {onStart();}// 如果已经有定时器存在，则清除它if (intervalRef.current !== null) {clearInterval(intervalRef.current!);}intervalRef.current = setInterval(() => {setButtonText(`${countdownRef.current}s后重试`);setCountdownRef((prevCountdown) => {if (prevCountdown <= 1) {clearInterval(intervalRef.current!);intervalRef.current = null;setButtonText(text);setIsDisabled(false);return countdownTime; // 重置倒计时时间}return prevCountdown - 1;});}, 1000);// 立即减少一次倒计时，使首次显示正确的剩余时间setCountdownRef((prevCountdown) => prevCountdown - 1);};// 使用自定义的setCountdownRef函数来更新倒计时值const setCountdownRef = (update: (current: number) => number) => {const newCountdown = update(countdownRef.current);countdownRef.current = newCountdown;};return (<Button {...restProps} onClick={handleStartCountdown} disabled={isDisabled}>{buttonText}</Button>);
};export default CountdownButton;

使用方法

<CountdownButton countdownTime={60} text={"获取验证码"} onStart={sendMsg} type="primary" />

效果