56个JavaScript 实用工具函数助你提升开发效率！
又到周五啦，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;
复制代码（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;
}
}
}
复制代码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;
}
复制代码（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;
}
复制代码（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;
};
复制代码（2）字符串首字母大写
export const fistLetterUpper = (str) => {
return str.charAt(0).toUpperCase() + str.slice(1);
};
复制代码（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);
};
复制代码（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())
}
复制代码（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())
}
复制代码（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');
};
复制代码（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[$1[0]]
}
}
});
}
复制代码5. 操作存储
（1）存储loalStorage
export const loalStorageSet = (key, value) => {
if (!key) return;
if (typeof value !== 'string') {
value = JSON.stringify(value);
}
window.localStorage.setItem(key, value);
};
复制代码（2）获取localStorage
export const loalStorageGet = (key) => {
if (!key) return;
return window.localStorage.getItem(key);
};
复制代码（3）删除localStorage
export const loalStorageRemove = (key) => {
if (!key) return;
window.localStorage.removeItem(key);
};
复制代码（4）存储sessionStorage
export const sessionStorageSet = (key, value) => {
if (!key) return;
if (typeof value !== 'string') {
value = JSON.stringify(value);
}
window.sessionStorage.setItem(key, value)
};
复制代码（5）获取sessionStorage
export const sessionStorageGet = (key) => {
if (!key) return;
return window.sessionStorage.getItem(key)
};
复制代码（6）删除sessionStorage
export const sessionStorageRemove = (key) => {
if (!key) return;
window.sessionStorage.removeItem(key)
};
复制代码6. 操作cookie
（1）设置cookie
export const setCookie = (key, value, expire) => {
const d = new Date();
d.setDate(d.getDate() + expire);
document.cookie = `${key}=${value};expires=${d.toUTCString()}`
};
复制代码（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
};
复制代码（3）删除cookie
export const delCookie = (key) => {
document.cookie = `${encodeURIComponent(key)}=;expires=${new Date()}`
};
复制代码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)$)/;
return reg.test(value);
};
复制代码（2）校验是否包含中文
export const haveCNChars => (value) => {
return /[\u4e00-\u9fa5]/.test(value);
}
复制代码（3）校验是否为中国大陆的邮政编码
export const isPostCode = (value) => {
return /^[1-9][0-9]{5}$/.test(value.toString());
}
复制代码（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));
}
复制代码（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_-]+)+$/.test(value);
}
复制代码（6）校验是否为中国大陆手机号
export const isTel = (value) => {
return /^1[3,4,5,6,7,8,9][0-9]{9}$/.test(value.toString());
}
复制代码（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;
}
复制代码8. 操作URL
（1）获取URL参数列表
export const GetRequest = () => {
let url = location.search;
const paramsStr = /.+\?(.+)$/.exec(url)[1]; // 将 ? 后面的字符串取出来
const paramsArr = paramsStr.split('&'); // 将字符串以 & 分割后存到数组中
let paramsObj = {};
// 将 params 存到对象中
paramsArr.forEach(param => {
if (/=/.test(param)) { // 处理有 value 的参数
let [key, val] = param.split('='); // 分割 key 和 value
val = decodeURIComponent(val); // 解码
val = /^\d+$/.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;
};
复制代码（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;
}
}
}
复制代码（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('&'))
}
复制代码（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;
}
复制代码（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,"&");
}
}
复制代码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';
}
复制代码（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());
}
复制代码（3）判断是否是安卓移动设备
export const isAndroidMobileDevice = () => {
return /android/i.test(navigator.userAgent.toLowerCase());
}
复制代码（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";
}
}
复制代码（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;
}
复制代码（6）浏览器型号和版本
export const getExplorerInfo = () => {
let t = navigator.userAgent.toLowerCase();
return 0 <= t.indexOf("msie") ? { //ie < 11
type: "IE",
version: Number(t.match(/msie ([\d]+)/)[1])
} : !!t.match(/trident\/.+?rv:(([\d.]+))/) ? { // ie 11
type: "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
}
}
复制代码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);
}
}
复制代码（2）滚动到页面底部
export const scrollToBottom = () => {
window.scrollTo(0, document.documentElement.clientHeight);
}
复制代码（3）滚动到指定元素区域
export const smoothScroll = (element) => {
document.querySelector(element).scrollIntoView({
behavior: 'smooth'
});
};
复制代码（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;
}
复制代码（5）获取可视窗口宽度
export const getPageViewWidth = () => {
return (document.compatMode == "BackCompat" ? document.body : document.documentElement).clientWidth;
}
复制代码（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()
}
}
复制代码（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()
}
}
复制代码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;
}
复制代码（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')
复制代码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
}
}
复制代码（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);
};
}
复制代码（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);
}
};
}
复制代码（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;
}
}
复制代码（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
}作者：CUGGZ
链接：https://juejin.cn/post/7019090370814279693
来源：稀土掘金
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。
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