56个实用的JavaScript 工具函数助你提升开发效率
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2022-03-21 08:32:21
目录（1）存储loalstorage（2）获取localstorage（3）删除localstorage（4）存储sessionstorage（5）获取sessionstorage（6）删除sessi...
实用工具函数：
1. 数字操作
（1）生成指定范围随机数
（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;
}
}
}
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;
}
（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;
}
（3）数组中获取随机数
export const sample = arr => arr[math.floor(math.random() * arr.length)];
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;
};
（2）字符串首字母大写
export const fistletterupper = (str) => {
return str.charat(0).touppercase() + str.slice(1);
};
（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);
};
（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())
}
（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())
}
（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;
}
（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;
}
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');
};
（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[$1[0]]
}
}
});
}
5. 操作存储
（1）存储loalstorage
export const loalstorageset = (key, value) => {
if (!key) return;
if (typeof value !== 'string') {
value = json.stringify(value);
}
window.localstorage.setitem(key, value);
};
（2）获取localstorage
export const loalstorageget = (key) => {
if (!key) return;
return window.localstorage.getitem(key);
};
（3）删除localstorage
export const loalstorageremove = (key) => {
if (!key) return;
window.localstorage.removeitem(key);
};
（4）存储sessionstorage
export const sessionstorageset = (key, value) => {
if (!key) return;
if (typeof value !== 'string') {
value = json.stringify(value);
}
window.sessionstorage.setitem(key, value)
};
（5）获取sessionstorage
export const sessionstorageget = (key) => {
if (!key) return;
return window.sessionstorage.getitem(key)
};
（6）删除sessionstorage
export const sessionstorageremove = (key) => {
if (!key) return;
window.sessionstorage.removeitem(key)
};
6. 操作cookie
（1）设置cookie
export const setcookie = (key, value, expire) => {
const d = new date();
d.setdate(d.getdate() + expire);
document.cookie = `${key}=${value};expires=${d.toutcstring()}`
};
（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
};
（3）删除cookie
export const delcookie = (key) => {
document.cookie = `${encodeuricomponent(key)}=;expires=${new date()}`
};
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)$)/;
return reg.test(value);
};
（2）校验是否包含中文
export const havecnchars => (value) => {
return /[\u4e00-\u9fa5]/.test(value);
}
（3）校验是否为*的邮政编码
export const ispostcode = (value) => {
return /^[1-9][0-9]{5}$/.test(value.tostring());
}
（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));
}
（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_-]+)+$/.test(value);
}
（6）校验是否为*手机号
export const istel = (value) => {
return /^1[3,4,5,6,7,8,9][0-9]{9}$/.test(value.tostring());
}
（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;
}
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;
};
（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;
}
}
}
（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('&'))
}
（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;
}
（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,"&");
}
}
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';
}
（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());
}
（3）判断是否是安卓移动设备
export const isandroidmobiledevice = () => {
return /android/i.test(navigator.useragent.tolowercase());
}
（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";
}
}
（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;
}
（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
}
}
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);
}
}
（2）滚动到页面底部
export const scrolltobottom = () => {
window.scrollto(0, document.documentelement.clientheight);
}
（3）滚动到指定元素区域
export const smoothscroll = (element) => {
document.queryselector(element).scrollintoview({
behavior: 'smooth'
});
};
（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;
}
（5）获取可视窗口宽度
export const getpageviewwidth = () => {
return (document.compatmode == "backcompat" ? document.body : document.documentelement).clientwidth;
}
（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()
}
}
（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()
}
}
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;
}
（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')
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
}
}
（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);
};
}
（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);
}
};
}
（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;
}
}
（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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