前端常用的js函数方法?

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1.邮箱

export const isEmail = (e) => {
return /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+((.[a-zA-Z0-9_-]{2,3}){1,2})$/.test(e)
}

2.手机号码

export const isMobile = (e) => {
return /^1[0-9]{10}$/.test(e)
}

3.电话号码

export const isPhone = (e) =>{
return /^([0-9]{3,4}-)?[0-9]{7,8}$/.test(e)
}

4.是否url地址

export const isURL = (e) => {
return /^http[s]?:\/\/.*/.test(e)
}

5.是否字符串

export const isString = (e) =>{
return Object.prototype.toString.call(e).slice(8,-1) === 'String'
}

6.是否数字

export const isNumber = (e) =>{
return Object.prototype.toString.call(e).slice(8,-1) ==='Number'
}

7.是否boolean

export const isBoolean = (e) =>{
return Object.prototype.toString.call(e).slice(8,-1) ==='Boolean'
}

8.是否函数

export const isFunction = (e) =>{
return Object.prototype.toString.call(e).slice(8,-1) === 'Function'
}

9.是否为null

export const isNull = (e) =>{
return Object.prototype.toString.call(e).slice(8,-1)==='Null'
}

10.是否undefined

export const isUndefined = (e) =>{
return Object.prototype.toString.call(e).slice(8,-1)==='Undefined'
} 

11.是否对象

export const isObject = (e) =>{
return Object.prototype.toString.call(e).slice(8,-1) === 'Object'
}

12.是否数组

export const isArray = (e) =>{
return Object.prototype.toString.call(e).slice(8,-1)==='Array'
} 

13.是否时间

export const isDate = (e) =>{
return Object.prototype.toString.call(e).slice(8,-1)==='Date'
} 

14.是否正则

export const isRegExp = (e) =>{
return Object.prototype.toString.call(e).slice(8,-1)==='RegExp'
}

15.是否错误对象

export const isError = (e) =>{
return Object.prototype.toString.call(e).slice(8,-1)==='Error'
}

16.是否Symbol函数

export const isSymbol = (e) =>{
return Object.prototype.toString.call(e).slice(8,-1)==='Symbol'
}

17.是否Promise对象

export const isPromise = (e) =>{
return Object.prototype.toString.call(e).slice(8,-1)==='Promise'
}

18.是否Set对象

export const isSet = (e) =>{
return Object.prototype.toString.call(e).slice(8,-1) ==='Set'
}
export const us = navigator.userAgent.toLowerCase();

19.是否是微信浏览器

export const isWeiXin = () =>{
return ua.match(/microMessenger/i) == 'micromessenger'
}

20.是否是移动端

export const isDeviceMobile =()=>{
return /android|webos|iphone|ipod|balckberry/i.test(ua)
}

21.是否是QQ浏览器

export const isQQBrowser = () =>{
return !!ua.match(/mqqbrowser|qzone|qqbrowser|qbwebviewtype/i)
}

22.是否是爬虫

export const isSpider =()=>{
return /adsbot|googlebot|bingbot|msnbot|yandexbot|baidubot|robot|careerbot|seznambot|bot|baiduspider|jikespider|symantecspider|scannerlwebcrawler|crawler|360spider|sosospider|sogou web sprider|sougou orion spider/.test(ua)
}

23.是否ios

export const isIos =()=>{
var u = navigator.userAgent;
if(u.indexOf('Android')>-1||u.indexOf('Linux')>-1){//安卓手机
return false
}else if(u.indexOf('iPhone')>-1){//苹果手机
return true
}else if(u.indexOf('iPad')>-1){//iPad
return false
}else if(u.indexOf('windows Phone')>-1){//winphone手机
return false
}else{
return false
}
}

24.是否PC端

export const isPC = ()=>{
var userAgentInfo = navigator.userAgent
var Agents = ['Android','iPhone','SymbuanOS','Windows Phone','iPad','iPod'];
var flag = true;
for(var i = 0;i<Agents.length;i++){
if(userAgentInfo.indexOf(Agents[i])>0){
flag = false;
break;
}
}
return flag;
}

25.去除html标签

export const removehtmltag = (str)=>{
return str.replace(/<[^>]+>/g,'')
}

26.获取url参数

export const getQueryString =(name)=>{
const reg = new RegExp('(^|&)'+name+'=([^&]*)(&|$)','i');
const search = window.location.search.split('?')[1]||'';
const r = search.match(reg) || [];
return r[2];
}

27.动态引入js

export const injectScript =(src)=>{
const s = document.createElement('script');
s.type = 'text/JavaScript';
s.async = true;
s.src = src;
const t = document.getElentsByTagName('script')[0];
t.parentNode.insertBefore(s,t)
}

28.根据url地址下载

export const download = (url)=>{
var isChrome = navigator.userAgent.toLowerCase().indexOf('chrome')>-1;
var isSafari = navigator.userAgent.toLowerCase().indexOf('safari')>-1;
if(isChrome || isSafari){
var link = document.createElement('a');
link.href = url;
if(link.download !== undefined){
var fileName = url.substring(url.lastIndexOf('/')+1,url.length);
link.download = fileName
}
if(document.createEvent){
var e = document.createEvent('MouseEvents');
e.initEvent('click',true,true);
link.dispatchEvent(e);
return true;
}
}
if(url.indexOf('?')===-1){
url+='?download'
}
window.open(url,'_self');
return true;
}

29.el是否包含某个class

export const hasClass = (el,className)=>{
let reg = new RegExp('(^|\\s)'+className+'(\\s|$)')
return reg.test(el.className)
}

30.el添加某个class

export const addClass = (el,className)=>{
if(hasClass(el,className)){
return
}
let newClass = el.className.split(' ')
newClass.push(className)
el.className = newClass.join(' ')
}

31.el去除某个class

export cosnt removeClass = (el,className)=>{
if(!hasClass(el,className)){
return
}
let reg = new RegExp('(^|\\s)'+className+'(\\s|$)','g')
el.className = el.className.replace(reg,'')
}

32.获取滚动的坐标

export const getScrollPosition = (el = window) => ({
x:el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft,
y:el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop
})

33.滚动到顶部

export cosnt scrollToTop = ()=>{
const c = document.documentElement.scrollTop || document.body.scrollTop;
if(c>0){
window.requestAnimationFrame(scrollToTop);
window.scrollTo(0,c-c/8);
}
}

34.el是否在视口范围

export const elementIsVisibleInViewport = (el,partiallyVisib = false)=>{
cosnt {top,left,right,bottom} = el.getBoundingClienRect();
const {innerHeight,innerWidth} = window;
return partiallyVisible
? ((top > 0 && top < innerHeight) || (bottom > 0 && bottom < innerHeight)) && ((left > 0 && left < innerWidth) || (right > 0 && right < innerWidth)) : top >= 0 && left >= 0 && bottom <= innerHeight && right <= innerWidth;
}

35.洗牌算法随机

export const shuffle = (arr) => { 
var result = [],
random;
while (arr.length > 0) { 
random = Math.floor(Math.random() * arr.length); result.push(arr[random])
arr.splice(random, 1) 
} 
return result;
}

36.拦截粘贴板

export const copyTextToClipboard = (value) => { 
var textArea = document.createElement("textarea"); textArea.style.background = 'transparent'; 
textArea.value = value;
document.body.appendChild(textArea);
textArea.select(); 
try { 
var successful = document.execCommand('copy'); 
} catch (err) { 
console.log('Oops, unable to copy'); 
} 
document.body.removeChild(textArea); 
}

37.判断类型集合

export const checkStr = (str, type) => { 
switch (type) { 
case 'phone':
//手机号码
return /^1[3|4|5|6|7|8|9][0-9]{9}$/.test(str); 
case 'tel':
//座机
return /^(0\d{2,3}-\d{7,8})(-\d{1,4})?$/.test(str);
case 'card':
//身份证 
return /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/.test(str); 
case 'pwd':
//密码以字母开头,长度在6~18之间,只能包含字母、数字和下划线 
return /^[a-zA-Z]\w{5,17}$/.test(str)
case 'postal':
//邮政编码
return /[1-9]\d{5}(?!\d)/.test(str);
case 'QQ':
//QQ号
return /^[1-9][0-9]{4,9}$/.test(str);
case 'email':
//邮箱 
return /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/.test(str); 
case 'money':
//金额(小数点2位) 
return /^\d*(?:\.\d{0,2})?$/.test(str);
case 'URL':
//网址
return /(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?/.test(str) 
case 'IP': 
//IP
return /((?:(?:25[0-5]|2[0-4]\\d|[01]?\\d?\\d)\\.){3}(?:25[0-5]|2[0-4]\\d|[01]?\\d?\\d))/.test(str); 
case 'date':
//日期时间
return /^(\d{4})\-(\d{2})\-(\d{2}) (\d{2})(?:\:\d{2}|:(\d{2}):(\d{2}))$/.test(str) || /^(\d{4})\-(\d{2})\-(\d{2})$/.test(str) case 'number':
//数字
return /^[0-9]$/.test(str);
case 'english':
//英文
return /^[a-zA-Z]+$/.test(str);
case 'chinese': 
//中文
return /^[\\u4E00-\\u9FA5]+$/.test(str);
case 'lower':
//小写 
return /^[a-z]+$/.test(str);
case 'upper':
//大写
return /^[A-Z]+$/.test(str);
case 'HTML': 
//HTML标记
return /<("[^"]*"|'[^']*'|[^'">])*>/.test(str); 
default: 
return true; 
} 
}

38.严格的身份证校验

export const isCardID =(sId)=>{
if (!/(^\d{15}$)|(^\d{17}(\d|X|x)$)/.test(sId)) {
console.log('你输入的身份证长度或格式错误')
return false 
}
//身份证城市 
var aCity = { 11: "北京", 12: "天津", 13: "河北", 14: "山西", 15: "内蒙古", 21: "辽宁", 22: "吉林", 23: "黑龙江", 31: "上海", 32: "江苏", 33: "浙江", 34: "安徽", 35: "福建", 36: "江西", 37: "山东", 41: "河南", 42: "湖北", 43: "湖南", 44: "广东", 45: "广西", 46: "海南", 50: "重庆", 51: "四川", 52: "贵州", 53: "云南", 54: "西藏", 61: "陕西", 62: "甘肃", 63: "青海", 64: "宁夏", 65: "新疆", 71: "台湾", 81: "香港", 82: "澳门", 91: "国外" };
if (!aCity[parseInt(sId.substr(0, 2))]) { 
console.log('你的身份证地区非法')
return false
}
// 出生日期验证
var sBirthday = (sId.substr(6, 4) + "-" + Number(sId.substr(10, 2)) + "-" + Number(sId.substr(12, 2))).replace(/-/g, "/"), d = new Date(sBirthday) 
if (sBirthday != (d.getFullYear() + "/" + (d.getMonth() + 1) + "/" + d.getDate())) { 
console.log('身份证上的出生日期非法') 
return false 
}
// 身份证号码校验
var sum = 0, weights = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2],
codes = "10X98765432" 
for (var i = 0; i < sId.length - 1; i++) { 
sum += sId[i] * weights[i]; 
} 
var last = codes[sum % 11];
//计算出来的最后一位身份证号码 
if (sId[sId.length - 1] != last) { 
console.log('你输入的身份证号非法') 
return false 
}
return true
}

39.随机数范围

export const random = (min, max) => { 
if (arguments.length === 2) { 
return Math.floor(min + Math.random() * ((max + 1) - min)) 
} else { 
return null; 
} 
}

40.将阿拉伯数字翻译成中文的大写数字

export const numberToChinese = (num) => {
var AA = new Array("零", "一", "二", "三", "四", "五", "六", "七", "八", "九", "十");
var BB = new Array("", "十", "百", "仟", "萬", "億", "点", ""); 
var a = ("" + num).replace(/(^0*)/g, "").split("."), k = 0, re = "";
for (var i = a[0].length - 1; i >= 0; i--) { 
switch (k) { 
case 0: re = BB[7] + re;
break; 
case 4:
if (!new RegExp("0{4}//d{" + (a[0].length - i - 1) + "}$") .test(a[0])) re = BB[4] + re;
break;
case 8:
re = BB[5] + re; BB[7] = BB[5]; k = 0;
break;
}
if (k % 4 == 2 && a[0].charAt(i + 2) != 0 && a[0].charAt(i + 1) == 0) re = AA[0] + re;
if (a[0].charAt(i) != 0) re = AA[a[0].charAt(i)] + BB[k % 4] + re; k++; }
if (a.length > 1) { re += BB[6]; 
for (var i = 0; i < a[1].length; i++) re += AA[a[1].charAt(i)];
} 
if (re == '一十') re = "十";
if (re.match(/^一/) && re.length == 3) re = re.replace("一", ""); return re;
}

41.将数字转换为大写金额

export const changeToChinese = (Num) => {
//判断如果传递进来的不是字符的话转换为字符
if (typeof Num == "number") { 
Num = new String(Num);
};
Num = Num.replace(/,/g, "") 
//替换tomoney()中的“,” 
Num = Num.replace(/ /g, "") 
//替换tomoney()中的空格
Num = Num.replace(/¥/g, "") 
//替换掉可能出现的¥字符 
if (isNaN(Num)) { 
//验证输入的字符是否为数字 
//alert("请检查小写金额是否正确");
return "";
}; 
//字符处理完毕后开始转换,采用前后两部分分别转换
var part = String(Num).split(".");
var newchar = ""; 
//小数点前进行转化
for (var i = part[0].length - 1; i >= 0; i--) { 
if (part[0].length > 10) { 
return ""; 
//若数量超过拾亿单位,提示
} 
var tmpnewchar = ""
var perchar = part[0].charAt(i); 
switch (perchar) {
case "0":
tmpnewchar = "零" + tmpnewchar;
break;
case "1": 
tmpnewchar = "壹" + tmpnewchar; 
break;
case "2":
tmpnewchar = "贰" + tmpnewchar; 
break;
case "3":
tmpnewchar = "叁" + tmpnewchar;
break;
case "4": tmpnewchar = "肆" + tmpnewchar;
break;
case "5": tmpnewchar = "伍" + tmpnewchar;
break;
case "6": tmpnewchar = "陆" + tmpnewchar; 
break;
case "7": tmpnewchar = "柒" + tmpnewchar;
break; 
case "8": tmpnewchar = "捌" + tmpnewchar; 
break; 
case "9": tmpnewchar = "玖" + tmpnewchar;
break;
}
switch (part[0].length - i - 1) {
case 0: 
tmpnewchar = tmpnewchar + "元";
break; 
case 1:
if (perchar != 0) tmpnewchar = tmpnewchar + "拾"; 
break;
case 2: 
if (perchar != 0) tmpnewchar = tmpnewchar + "佰";
break; 
case 3: 
if (perchar != 0) tmpnewchar = tmpnewchar + "仟";
break; 
case 4: 
tmpnewchar = tmpnewchar + "万"; 
break; 
case 5:
if (perchar != 0) tmpnewchar = tmpnewchar + "拾";
break;
case 6:
if (perchar != 0) tmpnewchar = tmpnewchar + "佰";
break;
case 7:
if (perchar != 0) tmpnewchar = tmpnewchar + "仟"; 
break; 
case 8:
tmpnewchar = tmpnewchar + "亿"; 
break; 
case 9: 
tmpnewchar = tmpnewchar + "拾"; 
break;
} 
var newchar = tmpnewchar + newchar; 
}
//小数点之后进行转化 
if (Num.indexOf(".") != -1) {
if (part[1].length > 2) {
// alert("小数点之后只能保留两位,系统将自动截断"
);
part[1] = part[1].substr(0, 2) } 
for (i = 0; i < part[1].length; i++) {
tmpnewchar = "" perchar = part[1].charAt(i) 
switch (perchar) { 
case "0":
tmpnewchar = "零" + tmpnewchar;
break;
case "1": 
tmpnewchar = "壹" + tmpnewchar;
break; 
case "2":
tmpnewchar = "贰" + tmpnewchar;
break;
case "3":
tmpnewchar = "叁" + tmpnewchar;
break;
case "4": 
tmpnewchar = "肆" + tmpnewchar;
break; 
case "5":
tmpnewchar = "伍" + tmpnewchar;
break; 
case "6":
tmpnewchar = "陆" + tmpnewchar;
break;
case "7": tmpnewchar = "柒" + tmpnewchar; 
break; 
case "8":
tmpnewchar = "捌" + tmpnewchar;
break;
case "9": 
tmpnewchar = "玖" + tmpnewchar; 
break; 
} 
if (i == 0) tmpnewchar = tmpnewchar + "角"; 
if (i == 1) tmpnewchar = tmpnewchar + "分"; 
newchar = newchar + tmpnewchar; } } 
//替换所有无用汉字 
while (newchar.search("零零") != -1) 
newchar = newchar.replace("零零", "零"); 
newchar = newchar.replace("零亿", "亿"); 
newchar = newchar.replace("亿万", "亿"); 
newchar = newchar.replace("零万", "万"); 
newchar = newchar.replace("零元", "元"); 
newchar = newchar.replace("零角", ""); 
newchar = newchar.replace("零分", ""); 
if (newchar.charAt(newchar.length - 1) == "元") { 
newchar = newchar + "整" 
} 
return newchar;
}

42.判断一个元素是否在数组中

export const contains = (arr, val) => { 
return arr.indexOf(val) != -1 ? true : false; 
}

43.数组排序,{type} 1:从小到大 2:从大到小 3:随机

export const sort = (arr, type = 1) => {
return arr.sort((a, b) => { 
switch (type) { 
case 1:
return a - b;
case 2:
return b - a;
case 3: 
return Math.random() - 0.5;
default:
return arr; 
} 
}) 
}

44.去重

export const unique = (arr) => { 
if (Array.hasOwnProperty('from')) { 
return Array.from(new Set(arr));
} else { 
var n = {},
r = []; 
for (var i = 0; i < arr.length; i++) { 
if (!n[arr[i]]) { 
n[arr[i]] = true;
r.push(arr[i]);
} 
} 
return r; 
}
}

45.求两个集合的并集

export const union = (a, b) => { 
var newArr = a.concat(b); 
return this.unique(newArr); 
}

46.求两个集合的交集

export const intersect = (a, b) => {
var _this = this;
a = this.unique(a);
return this.map(a, function (o) { 
return _this.contains(b, o) ? o : null; });
}

47.删除其中一个元素

export const remove = (arr, ele) => { 
var index = arr.indexOf(ele); 
if (index > -1) { 
arr.splice(index, 1); 
}
return arr; 
}

48.将类数组转换为数组

export const formArray = (ary) => { 
var arr = [];
if (Array.isArray(ary)) {
arr = ary;
} else {
arr = Array.prototype.slice.call(ary); 
}; 
return arr; 
}

49.最大值

export const max = (arr) => { 
return Math.max.apply(null, arr); 
}

50.最小值

export const min = (arr) => { 
return Math.min.apply(null, arr); 
}

51.求和

export const sum = (arr) => { 
return arr.reduce((pre, cur) => { return pre + cur }) 
}

52.平均值

export const average = (arr) => {
return this.sum(arr) / arr.length 
}

53.去除空格,type: 1-所有空格 2-前后空格 3-前空格 4-后空格

export const trim = (str, type) => {
type = type || 1 
switch (type) { 
case 1: 
return str.replace(/\s+/g, "");
case 2:
return str.replace(/(^\s*)|(\s*$)/g, "");
case 3:
return str.replace(/(^\s*)/g, "");
case 4: 
return str.replace(/(\s*$)/g, ""); 
default: 
return str;
} 
}

54.字符转换,type: 1:首字母大写 2:首字母小写 3:大小写转换 4:全部大写 5:全部小写

export const changeCase = (str, type) => { 
type = type || 4 
switch (type) {
case 1: 
return str.replace(/\b\w+\b/g, function (word) { 
return word.substring(0, 1).toUpperCase() + word.substring(1).toLowerCase(); 
});
case 2: 
return str.replace(/\b\w+\b/g, function (word) { 
return word.substring(0, 1).toLowerCase() + word.substring(1).toUpperCase(); 
}); 
case 3:
return str.split('').map(function (word) { 
if (/[a-z]/.test(word)) { 
return word.toUpperCase();
} else { 
return word.toLowerCase() } 
}).join('')
case 4:
return str.toUpperCase();
case 5: 
return str.toLowerCase();
default:
return str;
}
}

55.检测密码强度

export const checkPwd = (str) => {
var Lv = 0; 
if (str.length < 6) { 
return Lv 
} 
if (/[0-9]/.test(str)) { Lv++ } 
if (/[a-z]/.test(str)) { Lv++ }
if (/[A-Z]/.test(str)) { Lv++ } 
if (/[\.|-|_]/.test(str)) { Lv++ }
return Lv; 
}

56.函数节流器

export const debouncer = (fn, time, interval = 200) => { 
if (time - (window.debounceTimestamp || 0) > interval) {
fn && fn();
window.debounceTimestamp = time; 
} 
}

57.在字符串中插入新字符串

export const insertStr = (soure, index, newStr) => {
var str = soure.slice(0, index) + newStr + soure.slice(index); return str; 
}

58.判断两个对象是否键值相同

export const isObjectEqual = (a, b) => { 
var aProps = Object.getOwnPropertyNames(a);
var bProps = Object.getOwnPropertyNames(b); 
if (aProps.length !== bProps.length) {
return false; 
} 
for (var i = 0; i < aProps.length; i++) {
var propName = aProps[i]; 
if (a[propName] !== b[propName]) {
return false; 
} 
}
return true;
}

59.16进制颜色转RGBRGBA字符串

export const colorToRGB = (val, opa) => { 
var pattern = /^(#?)[a-fA-F0-9]{6}$/; 
//16进制颜色值校验规则 
var isOpa = typeof opa == 'number';
//判断是否有设置不透明度
if (!pattern.test(val)) {
//如果值不符合规则返回空字符
return ''; 
} 
var v = val.replace(/#/, ''); 
//如果有#号先去除#号 
var rgbArr = [];
var rgbStr = '';
for (var i = 0; i < 3; i++) { 
var item = v.substring(i * 2, i * 2 + 2);
var num = parseInt(item, 16); 
rgbArr.push(num); 
}
rgbStr = rgbArr.join();
rgbStr = 'rgb' + (isOpa ? 'a' : '') + '(' + rgbStr + (isOpa ? ',' + opa : '') + ')';
return rgbStr;
}

60.追加url参数

export const appendQuery = (url, key, value) => { 
var options = key;
if (typeof options == 'string') {
options = {}; 
options[key] = value;
} 
options = $.param(options);
if (url.includes('?')) {
url += '&' + options 
} else { 
url += '?' + options 
}
return url; 
}