- A+
所属分类：Web前端
生成指定范围的随机整数
const randomIntegerInRange = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min; randomIntegerInRange(0, 5);
生成指定范围的随机小数
const randomNumberInRange = (min, max) => Math.random() * (max - min) + min; randomNumberInRange(2, 10);
四舍五入到指定位数
const round = (n, decimals = 0) => Number(`${Math.round(`${n}e${decimals}`)}e-${decimals}`); round(1.005, 2);
精确小数
const RoundNum = (num, decimal) =>Math.round(num * 10 ** decimal) / 10 ** decimal;const num = RoundNum(1.69, 1);// num => 1.7
简单的货币单位转换
const toCurrency = (n, curr, LanguageFormat = undefined) => Intl.NumberFormat(LanguageFormat, { style: 'currency', currency: curr }).format(n); toCurrency(123456.789, 'EUR'); // €123,456.79 toCurrency(123456.789, 'USD', 'en-us'); // $123,456.79 toCurrency(123456.789, 'USD', 'fa'); // ۱۲۳٬۴۵۶٫۷۹ toCurrency(322342436423.2435, 'JPY'); // ¥322,342,436,423
随机十六进制颜色
const randomHexColorCode = () => { let n = (Math.random() * 0xfffff * 1000000).toString(16); return '#' + n.slice(0, 6); }; randomHexColorCode();
奇偶判断
const OddEven = num => !!(num & 1) ? "odd" : "even";const num = OddEven(2);// num => "even"
统计数组成员个数
const arr = [0, 1, 1, 2, 2, 2];const count = arr.reduce((t, v) => { t[v] = t[v] ? ++t[v] : 1; return t;}, {});// count => { 0: 1, 1: 2, 2: 3 }
数组中某元素出现的次数
export function countOccurrences(arr, value) { return arr.reduce((a, v) => v === value ? a + 1 : a + 0, 0); }
简单数组交集
export const similarity = (arr1, arr2) => arr1.filter(v => arr2.includes(v));
实现千位分隔符
// 保留三位小数 parseToMoney(1234.56); // return '1,234.56' parseToMoney(123456789); // return '123,456,789' parseToMoney(1087654.321); // return '1,087,654.321' function parseToMoney(num) { num = parseFloat(num.toFixed(3)); let [integer, decimal] = String.prototype.split.call(num, '.'); integer = integer.replace(/d(?=(d{3})+$)/g, '$&,'); return integer + '.' + (decimal ? decimal : ''); } function parseToMoney(str){ // 仅仅对位置进行匹配 let re = /(?=(?!b)(d{3})+$)/g; return str.replace(re,','); }
验证是否是身份证
function isCardNo(number) { var regx = /(^d{15}$)|(^d{18}$)|(^d{17}(d|X|x)$)/; return regx.test(number); }
