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// 扁平化数组
// const a = [1, [2, [3,4]]]; flaten(a)
const flaten = arr => 
    arr.reduce(
        (acc, cur) => Array.isArray(cur)?acc.concat(...fl(cur)):acc.concat(cur)
    ,[])

// 判断数组中某个值出现的次数
function countOccurrences(arr, value) {
  return arr.reduce((a, v) => (v === value ? a + 1 : a + 0), 0);

Averey

import { useState, useEffect } from "react";

/**
 * 根据 kw 过滤 list 的数据。用于纯前端数据搜索
 * initList: 没筛选时的初始列表
 * kw: 关键字，
 * list: 返回的结果列表
 * keys: list 的 item 中用于和 kw 匹配的key
 */
 function useSearchFilter(keys, _initlist) {

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.text-ellipsis {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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export const idUq = id => item => item.id !== id;
export const idEq = id => item => item.id === id;
export const getId = item => item.id;
export const callFn = (fn, ...params) => {
  if (typeof fn === 'function') {
    return fn.apply(null, params)
  }
}

export const a2z = (isUpper = false) => {

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// check list or object is null or empty
const isEmpty = obj = !obj || Object.keys(obj).length === 0;

export const isEmptyList = list => !list || list.length === 0;

export const isSameArray = (a1, a2) => {
    if ( isEmptyList(a1) && isEmptyList(a2)) return true;
    if (isEmptyList(a1) && !isEmptyList(a2)) return false;
    if (!isEmptyList(a1) && isEmptyList(a2)) return false;
    if (a1.length !== a2.length) return false;

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export function formatTime(_date, fm = 'YY.MM.DD hh:mm:ss') {
  let d
  if (Object.prototype.toString.call(_date).toLocaleLowerCase() === '[object date]') {
    d = _date
  } else {
    d = new Date(_date)
  }

  let year = d.getFullYear()
  let month = d.getMonth() + 1

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const str = "<p></p>"
/<[^>]+>/i.test(str);

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const params = (function() {
  const array = location.search.substr(1).split('&')
  const obj = {}
  array.forEach(item => {
    const a = item.split('=')
    const k = a[0]
    const v = a[1]
    obj[k] = v
  })
  return obj

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window.onscroll = function() {
  const documentEle = document.documentElement;
  const offset = documentEle.scrollTop + window.innerHeight;
  const height = documentEle.scrollHeight;
  
  if (offset === height) {
    console.log('At the bottom');
  }
  
}