小鑫の随笔

import { useCallback, useEffect, MutableRefObject } from "react";type keyType = KeyboardEvent["keyCode"] | KeyboardEvent["key"];type keyFilter = keyType | Array<keyType>;type EventHandler = (event: KeyboardEvent) => void;type keyEvent = "keyd

import { useRef, useState, useEffect } from 'react';/** * 解析毫秒为天、时、分、秒 * @param milliseconds 毫秒 */const parseMs = (milliseconds: number) => { return { days: Math.floor(milliseconds / 86400000), hours: Math.floor(milliseconds / 3600000) %

/** * 强制刷新 */export const useUpdate = () => { const [_, setState] = useState(0); return useCallback(() => { setState((num: number): number => num + 1); }, []);};点我查看代码运行效果阅读原文

// 判断日期是不是今天、昨天、明天const isToday = (str) => { let d = new Date(str).setHours(0, 0, 0, 0); let today = new Date().setHours(0, 0, 0, 0); let obj = { '-86400000': '昨天', 0: '今天', 86400000: '明天', }; return obj[d - toda

前言前些天写bug的时候，需要对数组按字母进行排序，就想到了 sort ，没想到还给了我个惊（jing）喜（xia）还原事故现场数组：[{letter: ‘a’}, {letter: ‘c’}, {letter: ‘b’}, {letter: ‘d’}]需要按数组元素的 letter 属性来排序，吓得我赶紧掏出了我的24K合金键盘来，三下五除二的写出了 sort 排序：let arr = [{letter: 'a'}, {letter: 'c'}, {letter: 'b'}, {letter