计算平均数
const average = arr => arr.reduce((a, b) => a + b) / arr.length;将RGB转为十六进制
const rgbToHex = (r, g, b) => '#' + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);计算两个日期相差的天数
const DayDiff = (firstDate, lastDate) => Math.ceil(Math.abs(firstDate.getTime() - lastDate.getTime()) / 1000 * 60 * 60 * 2);华氏度/摄氏度互相转换
# 华氏度转摄氏度const fahrenheitToCelsius = item => ((item - 32) * 5) / 9;# 摄氏度转华氏度const celsiusToFahrenheit = item => (item * 9) / 5 + 32;查问某个日期是否为工作日
const isWeekday = date => date.getDay() % 6 !== 0;获取选定的文本
const getSelectedText = () => window.getSelection().toString();文字复制到剪贴板
const copyText = async text => await navigator.clipboard.writeText(text);查看设施类型
const judgeDeviceType = () => /Android|webOS|iPhone|iPad|BlackBerry|IEMobile|OperaMini/i.test( navigator.userAgent ) ? 'Mobile' : 'PC';查看浏览器以后选项卡是否在后盾
const isTabActive = () => !document.hidden;生成随机十六进制色彩值
const randomHexColor = () => `#${Math.floor(Math.random() * 0xfffffff) .toString(16) .padEnd(6, '0')}`;反转字符串
const reverse = str => str.split(‘’).reverse().join(‘’);从url地址获取参数并转为对象
const getParameters = URL =>JSON.parse( `{"${decodeURI(URL.split('?')[1]) .replace(/"/g, '\\"') .replace(/&/g, '","') .replace(/=/g, '":"')}"}`);查看对象是否为空
const isEmpty = obj => Reflect.ownKeys(obj).length === 0 && obj.constructor === Object;多重条件判断优化
# 同一个值比照不同的值# name 为被比照的值if (name === ’tom’ || name === ‘doy’ || name === ‘daiwei') { // ...}# 升高耦合性的写法const nameArr = [’tom’, ‘doy’, ‘daiwei’];if (nameArr.includes(name)) { // ...}生成随机数
# 随机数最大值为max, 最小值为minconst getRandomNum = (min = 0, max = 10) => { return Math.floor(Math.random() * (max - min + 1)) + min;};前端搜寻
# arr 要搜寻的数组，text 要搜寻的内容# 含糊搜寻const result = (arr, text) => arr.filter(item => item === text);# 准确搜寻const result = (arr, text) => arr.find(item => item === text);