React+Typescript实现倒计时Hook的方法

首先对setInterval做了Hook化封装👇

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

实现倒计时Hook

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

写个demo看一下效果👇

  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>
    )
  }

到此这篇关于React+Typescript实现倒计时Hook的方法的文章就介绍到这了,更多相关React+Typescript实现倒计时 内容请搜索我们以前的文章或继续浏览下面的相关文章希望大家以后多多支持我们！