目的：
这篇文章主要是记录一下平时在项目中都会用到的一些通用方法，可以放在项目的utils文件下，使用起来比较方便。
日期对象转为日期字符串
/** * 日期对象转为日期字符串 * @param date 需要格式化的日期对象 * @param sFormat 输出格式,默认为yyyy-MM-dd 年：y，月：M，日：d，时：h，分：m，秒：s * @example dateFormat(new Date()) "2017-02-28" * @example dateFormat(new Date(),'yyyy-MM-dd') "2017-02-28" * @example dateFormat(new Date(),'yyyy-MM-dd hh:mm:ss') "2017-02-28 09:24:00" * @example dateFormat(new Date(),'hh:mm') "09:24" * @example dateFormat(new Date(),'yyyy-MM-ddThh:mm:ss+08:00') "2017-02-28T09:24:00+08:00" * @returns {boolean} */ function dateFormat(date, sFormat) { if (isEmpty(sFormat)) { sFormat = 'yyyy-MM-dd' } if (!(date instanceof Date)) { try { if (isEmpty(date)) { return '' } if (date.lastIndexOf('.') !== -1) { date = date.substr(0, date.lastIndexOf('.')) } date = date.replace(/\-/g, '/') // eslint-disable-line date = new Date(date) } catch (e) { console.log(e) } } let time = { Year: 0, TYear: '0', Month: 0, TMonth: '0', Day: 0, TDay: '0', Hour: 0, THour: '0', hour: 0, Thour: '0', Minute: 0, TMinute: '0', Second: 0, TSecond: '0', Millisecond: 0, } time.Year = date.getFullYear() time.TYear = String(time.Year).substr(2) time.Month = date.getMonth() + 1 time.TMonth = time.Month < 10 ? '0' + time.Month : String(time.Month) time.Day = date.getDate() time.TDay = time.Day < 10 ? '0' + time.Day : String(time.Day) time.Hour = date.getHours() time.THour = time.Hour < 10 ? '0' + time.Hour : String(time.Hour) time.hour = time.Hour < 13 ? time.Hour : time.Hour - 12 time.Thour = time.hour < 10 ? '0' + time.hour : String(time.hour) time.Minute = date.getMinutes() time.TMinute = time.Minute < 10 ? '0' + time.Minute : String(time.Minute) time.Second = date.getSeconds() time.TSecond = time.Second < 10 ? '0' + time.Second : String(time.Second) time.Millisecond = date.getMilliseconds() return sFormat.replace(/yyyy/ig, String(time.Year)) .replace(/yyy/ig, String(time.Year)) .replace(/yy/ig, time.TYear) .replace(/y/ig, time.TYear) .replace(/MM/g, time.TMonth) .replace(/M/g, String(time.Month)) .replace(/dd/ig, time.TDay) .replace(/d/ig, String(time.Day)) .replace(/HH/g, time.THour) .replace(/H/g, String(time.Hour)) .replace(/hh/g, time.Thour) .replace(/h/g, String(time.hour)) .replace(/mm/g, time.TMinute) .replace(/m/g, String(time.Minute)) .replace(/ss/ig, time.TSecond) .replace(/s/ig, String(time.Second)) .replace(/fff/ig, String(time.Millisecond)) }
字符串转成时间
/** * 字符串转成时间 * @param v * @return {Object} */ const stingToTime = (v) => { if(!isEmpty(v)){ return { year: v.slice(0, 4), month: v.slice(4, 6), day: v.slice(6, 8), hour: v.slice(8, 10), minute: v.slice(10, 12), second: v.slice(12,14), } } }判断对象为空
/** * 判断对象为空 * @param v * @return {boolean} */ const isEmpty = (v) => { if (typeof v === 'undefined') { return true } if (v === undefined || v === 'undefined') { return true } if (v === null) { return true } if (v === '' || v === 'null') { return true } if (v === 0) { return true } switch (typeof v) { case 'string' : if (v.trim().length === 0) { return true } break case 'boolean' : if (!v) { return true } break case 'number' : if (v === 0) { return true } break case 'object' : return undefined !== v.length && v.length === 0 } return false }判断手机号码是否正确
/** * 手机号码是否正确 * @param number 手机号码 * @return Boolean * */ const isMobileNumber = (number) => { return /^(13[0-9]|14[579]|15[012356789]|16[6]|17[0135678]|18[0-9]|19[89])\d{8}$/.test(number) }-
生成唯一id
/** * 生成唯一的id * @param len 长度 * @param radix 基数 * */ const uuid = (len, radix) => { let chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split(''); let uuid = [], i; radix = radix || chars.length; if (len) { // Compact form for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random()*radix]; } else { // rfc4122, version 4 form let r; // rfc4122 requires these characters uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-'; uuid[14] = '4'; // Fill in random data. At i==19 set the high bits of clock sequence as // per rfc4122, sec. 4.1.5 for (i = 0; i < 36; i++) { if (!uuid[i]) { r = 0 | Math.random()*16; uuid[i] = chars[(i === 19) ? (r & 0x3) | 0x8 : r]; } } } return uuid.join(''); } 正则匹配数字
/** * 正则匹配数字 * @param value 要匹配的值 * @param type 保留的小数点位数,最多四位 * */ const matchInputByRegular = (value, type = 2) => { if(type === 0) { return value.replace(/[^\d]/g, ''); } if(type === 2) { return value.replace(/^\D*(\d*(?:\.\d{0,2})?).*$/g, '$1'); } if(type === 3) { return value.replace(/^\D*(\d*(?:\.\d{0,3})?).*$/g, '$1'); } if(type === 4 ) { return value.replace(/^\D*(\d*(?:\.\d{0,4})?).*$/g, '$1'); } }小数自动取两位，不足补全
/** * 小数自动取两位，不足自动补全 * @param value 要匹配的值 * */ const changeTwoDecimal = (x) => { let fx = parseFloat(x); if (isNaN(fx)) { alert('function:changeTwoDecimal->parameter error'); return false; } fx = Math.round(x * 100) / 100; let sx = fx.toString(); let posdecimal = sx.indexOf('.'); if (posdecimal < 0) { posdecimal = sx.length; sx += '.'; } while (sx.length <= posdecimal + 2) { sx += '0'; } return sx; }乘法运算，避免数据相乘小数点后产生多位数和计算精度损失
/** * 乘法运算，避免数据相乘小数点后产生多位数和计算精度损失。 * * @param num1被乘数 | num2乘数 */ const bcmul = (num1, num2,s) => { let baseNum = 0,ret; try { if (num1.indexOf(".") !== -1){ baseNum += num1.split(".")[1].length; } else { baseNum += 0; } } catch (e) { console.log(e) } try { if (num2.indexOf(".") !== -1){ baseNum += num2.split(".")[1].length; } else { baseNum += 0; } } catch (e) { console.log(e) } ret=Number(num1.replace(".", "")) * Number(num2.replace(".", "")) / Math.pow(10, baseNum); return bcFixed(ret,s); }
