React+Typescript实现倒计时Hook的方法

import { useEffect, useRef } from 'react'/** * interTerval hooks组件 * @param fn 执行函数 * @param delay 时间 * @param options immediate为true时，先立即执行一次fn函数后再执行定时器 */function useInterval(  fn: () => void,  delay: number | null | undefined,  options?: {    immediate?: boolean  }): void {  const immediate = options?.immediate  const timerRef = useRef<() => void>()  timerRef.current = fn  useEffect(() => {    if (delay === undefined || delay === null) {      return    }    if (immediate) {      timerRef.current?.()    }    const timer = setInterval(() => {      timerRef.current?.()    }, delay)    return () => {      clearInterval(timer)    }  }, [delay])}export default useInterval

import { useState, useEffect, useRef, useMemo } from 'react'import { useInterval } from './'interface ITime {  /** 当前时间 */  currentTime?: number  /** 结束时间 */  endTime?: number  /** 另一种方式，不传当前时间和结束时间，直接传时间差 */  differTime?: number}interface ICbTime {  d: number  h: number  m: number  s: number}/** * 倒计时hooks * @param options 时间对象 * @param cb 倒计时完成时执行的回调函数 * @param noImmediate 时间传进来满足执行回调条件时，是否立即执行回调，默认false执行 */function useCountDown(  options: ITime,  cb?: () => void,  noImmediate?: boolean): ICbTime {  const { currentTime = 0, endTime = 0, differTime = 0 } = options  const [diffTime, setDiffTime] = useState(0)  /** 组件接收到参数时的时间 */  const entryTime = useRef<number>(0)  /** 当前倒计时要求的时间差 */  const maxTime = useRef<number>(0)  /** 是否可以执行回调 */  const isImplementCb = useRef(false)  useEffect(() => {    if (!isImplementCb.current) {      isImplementCb.current = true    }    if ((currentTime > 0 && endTime > 0) || differTime > 0) {      entryTime.current = new Date().getTime()      maxTime.current = differTime > 0 ? differTime : endTime - currentTime      if (maxTime.current <= 0 && noImmediate) {        isImplementCb.current = false      }      setDiffTime(maxTime.current)    }  }, [currentTime, endTime, differTime])  useInterval(    () => {      const curtTimes = new Date().getTime()      const TimeDifference = curtTimes - entryTime.current      setDiffTime(maxTime.current - TimeDifference)    },    diffTime <= 0 ? null : 1000  )  const timeObj = useMemo(() => {    const time = diffTime > 0 ? diffTime / 1000 : 0    const d = Math.floor(time / (24 * 60 * 60))    const h = Math.floor((time / (60 * 60)) % 24)    const m = Math.floor((time / 60) % 60)    const s = Math.ceil(time % 60)    if (diffTime <= 0 && isImplementCb.current) {      /**       * setTimeout用于解决react报错问题：       * annot update during an existing state transition (such as within `render`).       * Render methods should be a pure function of props and state.       */      setTimeout(() => {        cb?.()      }, 0)    }    return { d, h, m, s }  }, [diffTime])  return timeObj || ({} as ICbTime)}export default useCountDown

  const TimeArea = () => {    const { d, h, m, s } = useCountDown(      {        currentTime: 1631262176333,        endTime: 1831062176333      },      () => {        alert('倒计时结束')      }    )    return (      <div style={{ width: '200px', height: '200px' }}>        距离任务结束 {d}天<i>{h < 10 ? '0' + h : h}</i>:        <i>{m < 10 ? '0' + m : m}</i>:<i>{s < 10 ? '0' + s : s}</i>      </div>    )  }