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网上收集到的一些常用函数 /** * @description: 校验身份证 * @param {*} * @return {*} */ export const validateIDCard = value => /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/.test(value); /** * @description: 校验支付宝账号 * @param {*} * @return {*} */ export const validateAlipay = value => /^1\d{10}$|^[a-zA-Z\d._-]*\@[a-zA-Z\d.-]{1,10}\.[a-zA-Z\d]{1,20}$/.test(value); /** * @description: 校验银行卡 * @param {*} * @return {*} */ export const validateBankCode = value => /^\d{13,19}$/.test(value); /** * @description: 校验手机号 * @param {*} * @return {*} */ export const validatePhone = value => /^1\d{10}$/.test(value); /** * @description: 函数节流 * @param {*} * @return {*} */ export const throttle = function (fn, delay = 1000) { let prev = 0; return function () { const now = Date.now(); if (now - prev > delay) { fn.apply(this, arguments); prev = Date.now(); } } } /** * @description: 获取随机字符串 * @param {*} * @return {*} */ export const randomString = () => Math.random().toString(36).substr(2); /** * @description: 将 BASE64 转换文件 * @param {*} * @return {*} */ export const dataURLtoFile = (dataurl, filename) => { const arr = dataurl.split(','); const mime = arr[0].match(/:(.*?);/)[1]; if (!filename) filename = `${Date.parse(new Date())}.jpg`; const bstr = window.atob(arr[1]); let n = bstr.length; const u8arr = new Uint8Array(n); while (n--) { u8arr[n] = bstr.charCodeAt(n); } return new File([u8arr], filename, { type: mime }); } /** * @description: 压缩图片 * @param {*} * @return {*} */ export const compressImg = file => { const fileSize = parseFloat(Number.parseInt(file.size, 10) / 1024 / 1024).toFixed(2); const reader = new FileReader(); reader.readAsDataURL(file); return new Promise((resolve) => { reader.onload = e => { const img = new Image(); img.src = e.target.result; img.onload = () => { const w = img.width; const h = img.height; const canvas = document.createElement('canvas'); const ctx = canvas.getContext('2d'); let base64; canvas.setAttribute('width', w); canvas.setAttribute('height', h); ctx.drawImage(img, 0, 0, w, h); if (fileSize <= 1) { base64 = canvas.toDataURL(file.type, 1); } else if (fileSize <= 3) { base64 = canvas.toDataURL(file.type, 0.8); } else if (fileSize <= 5) { base64 = canvas.toDataURL(file.type, 0.5); } else { base64 = canvas.toDataURL(file.type, 0.1); } let fileName = file.name; fileName = fileName.replace(/^(.+)\.(.+)$/, (fullName, name, suffix) => name + Math.floor(Math.random() * (9999 - 1000) + 1000) + '.' + suffix); resolve(dataURLtoFile(base64, fileName)); }; }; }); }
