作者：CUGGZ

https://juejin.cn/post/7019090370814279693

又快到周五啦，快来一起摸鱼呀！今天来看看JavaScript中的一些实用的工具函数，希望能帮助你提高开发效率！整理不易，如果觉得有用就点个赞吧！

1. 数字操作

（1）生成指定范围随机数

export const randomNum = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min;
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（2）数字千分位分隔

export const format = (n) => {let num = n.toString();let len = num.length;if (len <= 3) {return num;} else {let temp = '';let remainder = len % 3;if (remainder > 0) { // 不是3的整数倍return num.slice(0, remainder) + ',' + num.slice(remainder, len).match(/\d{3}/g).join(',') + temp;} else { // 3的整数倍return num.slice(0, len).match(/\d{3}/g).join(',') + temp; }}
}
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2. 数组操作

（1）数组乱序

export const arrScrambling = (arr) => {for (let i = 0; i < arr.length; i++) {const randomIndex = Math.round(Math.random() * (arr.length - 1 - i)) + i;[arr[i], arr[randomIndex]] = [arr[randomIndex], arr[i]];}return arr;
}
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（2）数组扁平化

export const flatten = (arr) => {let result = [];for(let i = 0; i < arr.length; i++) {if(Array.isArray(arr[i])) {result = result.concat(flatten(arr[i]));} else {result.push(arr[i]);}}return result;
}
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（3）数组中获取随机数

export const sample = arr => arr[Math.floor(Math.random() * arr.length)];复制代码

3. 字符串操作

（1）生成随机字符串

export const randomString = (len) => {let chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz123456789';let strLen = chars.length;let randomStr = '';for (let i = 0; i < len; i++) {randomStr += chars.charAt(Math.floor(Math.random() * strLen));}return randomStr;
};
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（2）字符串首字母大写

export const fistLetterUpper = (str) => {return str.charAt(0).toUpperCase() + str.slice(1);
};
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（3）手机号中间四位变成*

export const telFormat = (tel) => {tel = String(tel); return tel.substr(0,3) + "****" + tel.substr(7);
};
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（4）驼峰命名转换成短横线命名

export const getKebabCase = (str) => {return str.replace(/[A-Z]/g, (item) => '-' + item.toLowerCase())
}
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（5）短横线命名转换成驼峰命名

export const getCamelCase = (str) => {return str.replace( /-([a-z])/g, (i, item) => item.toUpperCase())
}
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（6）全角转换为半角

export const toCDB = (str) => {let result = "";for (let i = 0; i < str.length; i++) {code = str.charCodeAt(i);if (code >= 65281 && code <= 65374) {result += String.fromCharCode(str.charCodeAt(i) - 65248);} else if (code == 12288) {result += String.fromCharCode(str.charCodeAt(i) - 12288 + 32);} else {result += str.charAt(i);}}return result;
}复制代码

（7）半角转换为全角

export const toDBC = (str) => {let result = "";for (let i = 0; i < str.length; i++) {code = str.charCodeAt(i);if (code >= 33 && code <= 126) {result += String.fromCharCode(str.charCodeAt(i) + 65248);} else if (code == 32) {result += String.fromCharCode(str.charCodeAt(i) + 12288 - 32);} else {result += str.charAt(i);}}return result;
}复制代码

4. 格式转化

（1）数字转化为大写金额

export const digitUppercase = (n) => {const fraction = ['角', '分'];const digit = ['零', '壹', '贰', '叁', '肆','伍', '陆', '柒', '捌', '玖'];const unit = [['元', '万', '亿'],['', '拾', '佰', '仟']];n = Math.abs(n);let s = '';for (let i = 0; i < fraction.length; i++) {s += (digit[Math.floor(n * 10 * Math.pow(10, i)) % 10] + fraction[i]).replace(/零./, '');}s = s || '整';n = Math.floor(n);for (let i = 0; i < unit[0].length && n > 0; i++) {let p = '';for (let j = 0; j < unit[1].length && n > 0; j++) {p = digit[n % 10] + unit[1][j] + p;n = Math.floor(n / 10);}s = p.replace(/(零.)*零$/, '').replace(/^$/, '零') + unit[0][i] + s;}return s.replace(/(零.)*零元/, '元').replace(/(零.)+/g, '零').replace(/^整$/, '零元整');
};
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（2）数字转化为中文数字

export const intToChinese = (value) => {const str = String(value);const len = str.length-1;const idxs = ['','十','百','千','万','十','百','千','亿','十','百','千','万','十','百','千','亿'];const num = ['零','一','二','三','四','五','六','七','八','九'];return str.replace(/([1-9]|0+)/g, ( $, $1, idx, full) => {let pos = 0;if($1[0] !== '0'){pos = len-idx;if(idx == 0 && $1[0] == 1 && idxs[len-idx] == '十'){return idxs[len-idx];}return num[$1[0]] + idxs[len-idx];} else {let left = len - idx;let right = len - idx + $1.length;if(Math.floor(right / 4) - Math.floor(left / 4) > 0){pos = left - left % 4;}if( pos ){return idxs[pos] + num[$1[0]];} else if( idx + $1.length >= len ){return '';}else {return num[$1[0]]}}});
}
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5. 操作存储

（1）存储loalStorage

export const loalStorageSet = (key, value) => {if (!key) return;if (typeof value !== 'string') {value = JSON.stringify(value);}window.localStorage.setItem(key, value);
};
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（2）获取localStorage

export const loalStorageGet = (key) => {if (!key) return;return window.localStorage.getItem(key);
};
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（3）删除localStorage

export const loalStorageRemove = (key) => {if (!key) return;window.localStorage.removeItem(key);
};
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（4）存储sessionStorage

export const sessionStorageSet = (key, value) => {if (!key) return;if (typeof value !== 'string') {value = JSON.stringify(value);}window.sessionStorage.setItem(key, value)
};
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（5）获取sessionStorage

export const sessionStorageGet = (key) => {if (!key) return;return window.sessionStorage.getItem(key)
};
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（6）删除sessionStorage

export const sessionStorageRemove = (key) => {if (!key) return;window.sessionStorage.removeItem(key)
};
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6. 操作cookie

（1）设置cookie

export const setCookie = (key, value, expire) => {const d = new Date();d.setDate(d.getDate() + expire);document.cookie = `${key}=${value};expires=${d.toUTCString()}`
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（2）读取cookie

export const getCookie = (key) => {const cookieStr = unescape(document.cookie);const arr = cookieStr.split('; ');let cookieValue = '';for (let i = 0; i < arr.length; i++) {const temp = arr[i].split('=');if (temp[0] === key) {cookieValue = temp[1];break}}return cookieValue
};
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（3）删除cookie

export const delCookie = (key) => {document.cookie = `${encodeURIComponent(key)}=;expires=${new Date()}`
};
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7. 格式校验

（1）校验身份证号码

export const checkCardNo = (value) => {let reg = /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/;return reg.test(value);
};
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（2）校验是否包含中文

export const haveCNChars => (value) => {return /[\u4e00-\u9fa5]/.test(value);
}
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（3）校验是否为中国大陆的邮政编码

export const isPostCode = (value) => {return /^[1-9][0-9]{5}$/.test(value.toString());
}
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（4）校验是否为IPv6地址

export const isIPv6 = (str) => {return Boolean(str.match(/:/g)?str.match(/:/g).length<=7:false && /::/.test(str)?/^([\da-f]{1,4}(:|::)){1,6}[\da-f]{1,4}$/i.test(str):/^([\da-f]{1,4}:){7}[\da-f]{1,4}$/i.test(str));
}
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（5）校验是否为邮箱地址

export const isEmail = (value) {return /^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/.test(value);
}
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（6）校验是否为中国大陆手机号

export const isTel = (value) => {return /^1[3,4,5,6,7,8,9][0-9]{9}$/.test(value.toString());
}
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（7）校验是否包含emoji表情

export const isEmojiCharacter = (value) => {value = String(value);for (let i = 0; i < value.length; i++) {const hs = value.charCodeAt(i);if (0xd800 <= hs && hs <= 0xdbff) {if (value.length > 1) {const ls = value.charCodeAt(i + 1);const uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;if (0x1d000 <= uc && uc <= 0x1f77f) {return true;}}} else if (value.length > 1) {const ls = value.charCodeAt(i + 1);if (ls == 0x20e3) {return true;}} else {if (0x2100 <= hs && hs <= 0x27ff) {return true;} else if (0x2B05 <= hs && hs <= 0x2b07) {return true;} else if (0x2934 <= hs && hs <= 0x2935) {return true;} else if (0x3297 <= hs && hs <= 0x3299) {return true;} else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030|| hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b|| hs == 0x2b50) {return true;}}}return false;
}
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8. 操作URL

（1）获取URL参数列表

export const GetRequest = () => {let url = location.search;const paramsStr = /.+\?(.+)$/.exec(url)[1]; // 将 ? 后面的字符串取出来const paramsArr = paramsStr.split('&'); // 将字符串以 & 分割后存到数组中let paramsObj = {};// 将 params 存到对象中paramsArr.forEach(param => {if (/=/.test(param)) { // 处理有 value 的参数let [key, val] = param.split('='); // 分割 key 和 valueval = decodeURIComponent(val); // 解码val = /^\d+$/.test(val) ? parseFloat(val) : val; // 判断是否转为数字if (paramsObj.hasOwnProperty(key)) { // 如果对象有 key，则添加一个值paramsObj[key] = [].concat(paramsObj[key], val);} else { // 如果对象没有这个 key，创建 key 并设置值paramsObj[key] = val;}} else { // 处理没有 value 的参数paramsObj[param] = true;}})return paramsObj;
};
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（2）检测URL是否有效

export const getUrlState = (URL) => {let xmlhttp = new ActiveXObject("microsoft.xmlhttp");xmlhttp.Open("GET", URL, false);try {xmlhttp.Send();} catch (e) {} finally {let result = xmlhttp.responseText;if (result) {if (xmlhttp.Status == 200) {return true;} else {return false;}} else {return false;}}
}
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（3）键值对拼接成URL参数

export const params2Url = (obj) => {let params = []for (let key in obj) {params.push(`${key}=${obj[key]}`);}return encodeURIComponent(params.join('&'))
}
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（4）修改URL中的参数

export const replaceParamVal => (paramName, replaceWith) {const oUrl = location.href.toString();const re = eval('/('+ paramName+'=)([^&]*)/gi');location.href = oUrl.replace(re,paramName+'='+replaceWith);return location.href;
}
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（5）删除URL中指定参数

export const funcUrlDel = (name) => {const baseUrl = location.origin + location.pathname + "?";const query = location.search.substr(1);if (query.indexOf(name) > -1) {const obj = {};const arr = query.split("&");for (let i = 0; i < arr.length; i++) {arr[i] = arr[i].split("=");obj[arr[i][0]] = arr[i][1];}delete obj[name];return baseUrl + JSON.stringify(obj).replace(/[\"\{\}]/g,"").replace(/\:/g,"=").replace(/\,/g,"&");}
}
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9. 设备判断

（1）判断是移动还是PC设备

export const isMobile = () => {if ((navigator.userAgent.match(/(iPhone|iPod|Android|ios|iOS|iPad|Backerry|WebOS|Symbian|Windows Phone|Phone)/i))) {return 'mobile';}return 'desktop';
}
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（2）判断是否是苹果还是安卓移动设备

export const isAppleMobileDevice = () => {let reg = /iphone|ipod|ipad|Macintosh/i;return reg.test(navigator.userAgent.toLowerCase());
}
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（3）判断是否是安卓移动设备

export const isAndroidMobileDevice = () => {return /android/i.test(navigator.userAgent.toLowerCase());
}
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（4）判断是Windows还是Mac系统

export const osType = () => {const agent = navigator.userAgent.toLowerCase();const isMac = /macintosh|mac os x/i.test(navigator.userAgent);const isWindows = agent.indexOf("win64") >= 0 || agent.indexOf("wow64") >= 0 || agent.indexOf("win32") >= 0 || agent.indexOf("wow32") >= 0;if (isWindows) {return "windows";}if(isMac){return "mac";}
}
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（5）判断是否是微信/QQ内置浏览器

export const broswer = () => {const ua = navigator.userAgent.toLowerCase();if (ua.match(/MicroMessenger/i) == "micromessenger") {return "weixin";} else if (ua.match(/QQ/i) == "qq") {return "QQ";}return false;
}
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（6）浏览器型号和版本

export const getExplorerInfo = () => {let t = navigator.userAgent.toLowerCase();return 0 <= t.indexOf("msie") ? { //ie < 11type: "IE",version: Number(t.match(/msie ([\d]+)/)[1])} : !!t.match(/trident\/.+?rv:(([\d.]+))/) ? { // ie 11type: "IE",version: 11} : 0 <= t.indexOf("edge") ? {type: "Edge",version: Number(t.match(/edge\/([\d]+)/)[1])} : 0 <= t.indexOf("firefox") ? {type: "Firefox",version: Number(t.match(/firefox\/([\d]+)/)[1])} : 0 <= t.indexOf("chrome") ? {type: "Chrome",version: Number(t.match(/chrome\/([\d]+)/)[1])} : 0 <= t.indexOf("opera") ? {type: "Opera",version: Number(t.match(/opera.([\d]+)/)[1])} : 0 <= t.indexOf("Safari") ? {type: "Safari",version: Number(t.match(/version\/([\d]+)/)[1])} : {type: t,version: -1}
}
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10. 浏览器操作

（1）滚动到页面顶部

export const scrollToTop = () => {const height = document.documentElement.scrollTop || document.body.scrollTop;if (height > 0) {window.requestAnimationFrame(scrollToTop);window.scrollTo(0, height - height / 8);}
}
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（2）滚动到页面底部

export const scrollToBottom = () => {window.scrollTo(0, document.documentElement.clientHeight);
}
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（3）滚动到指定元素区域

export const smoothScroll = (element) => {document.querySelector(element).scrollIntoView({behavior: 'smooth'});
};
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（4）获取可视窗口高度

export const getClientHeight = () => {let clientHeight = 0;if (document.body.clientHeight && document.documentElement.clientHeight) {clientHeight = (document.body.clientHeight < document.documentElement.clientHeight) ? document.body.clientHeight : document.documentElement.clientHeight;}else {clientHeight = (document.body.clientHeight > document.documentElement.clientHeight) ? document.body.clientHeight : document.documentElement.clientHeight;}return clientHeight;
}
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（5）获取可视窗口宽度

export const getPageViewWidth = () => {return (document.compatMode == "BackCompat" ? document.body : document.documentElement).clientWidth;
}
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（6）打开浏览器全屏

export const toFullScreen = () => {let element = document.body;if (element.requestFullscreen) {element.requestFullscreen()} else if (element.mozRequestFullScreen) {element.mozRequestFullScreen()} else if (element.msRequestFullscreen) {element.msRequestFullscreen()} else if (element.webkitRequestFullscreen) {element.webkitRequestFullScreen()}
}
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（7）退出浏览器全屏

export const exitFullscreen = () => {if (document.exitFullscreen) {document.exitFullscreen()} else if (document.msExitFullscreen) {document.msExitFullscreen()} else if (document.mozCancelFullScreen) {document.mozCancelFullScreen()} else if (document.webkitExitFullscreen) {document.webkitExitFullscreen()}
}
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11. 时间操作

（1）当前时间

export const nowTime = () => {const now = new Date();const year = now.getFullYear();const month = now.getMonth();const date = now.getDate() >= 10 ? now.getDate() : ('0' + now.getDate());const hour = now.getHours() >= 10 ? now.getHours() : ('0' + now.getHours());const miu = now.getMinutes() >= 10 ? now.getMinutes() : ('0' + now.getMinutes());const sec = now.getSeconds() >= 10 ? now.getSeconds() : ('0' + now.getSeconds());return +year + "年" + (month + 1) + "月" + date + "日 " + hour + ":" + miu + ":" + sec;
}
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（2）格式化时间

export const dateFormater = (formater, time) => {let date = time ? new Date(time) : new Date(),Y = date.getFullYear() + '',M = date.getMonth() + 1,D = date.getDate(),H = date.getHours(),m = date.getMinutes(),s = date.getSeconds();return formater.replace(/YYYY|yyyy/g, Y).replace(/YY|yy/g, Y.substr(2, 2)).replace(/MM/g,(M<10 ? '0' : '') + M).replace(/DD/g,(D<10 ? '0' : '') + D).replace(/HH|hh/g,(H<10 ? '0' : '') + H).replace(/mm/g,(m<10 ? '0' : '') + m).replace(/ss/g,(s<10 ? '0' : '') + s)
}
// dateFormater('YYYY-MM-DD HH:mm:ss')
// dateFormater('YYYYMMDDHHmmss')
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12. JavaScript操作

（1）阻止冒泡事件

export const stopPropagation = (e) => { e = e || window.event; if(e.stopPropagation) {    // W3C阻止冒泡方法 e.stopPropagation(); } else { e.cancelBubble = true; // IE阻止冒泡方法 }
}
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（2）防抖函数

export const debounce = (fn, wait) => {let timer = null;return function() {let context = this,args = arguments;if (timer) {clearTimeout(timer);timer = null;}timer = setTimeout(() => {fn.apply(context, args);}, wait);};
}
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（3）节流函数

export const throttle = (fn, delay) => {let curTime = Date.now();return function() {let context = this,args = arguments,nowTime = Date.now();if (nowTime - curTime >= delay) {curTime = Date.now();return fn.apply(context, args);}};
}
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（4）数据类型判断

export const getType = (value) => {if (value === null) {return value + "";}// 判断数据是引用类型的情况if (typeof value === "object") {let valueClass = Object.prototype.toString.call(value),type = valueClass.split(" ")[1].split("");type.pop();return type.join("").toLowerCase();} else {// 判断数据是基本数据类型的情况和函数的情况return typeof value;}
}
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（5）对象深拷贝

export const deepClone = (obj, hash = new WeakMap()) => {// 日期对象直接返回一个新的日期对象if (obj instanceof Date){return new Date(obj);} //正则对象直接返回一个新的正则对象     if (obj instanceof RegExp){return new RegExp(obj);     }//如果循环引用,就用 weakMap 来解决if (hash.has(obj)){return hash.get(obj);}// 获取对象所有自身属性的描述let allDesc = Object.getOwnPropertyDescriptors(obj);// 遍历传入参数所有键的特性let cloneObj = Object.create(Object.getPrototypeOf(obj), allDesc)hash.set(obj, cloneObj)for (let key of Reflect.ownKeys(obj)) { if(typeof obj[key] === 'object' && obj[key] !== null){cloneObj[key] = deepClone(obj[key], hash);} else {cloneObj[key] = obj[key];}}return cloneObj
}
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