前端必备技术:js封装常用的60个方法

455 阅读4分钟

1.邮箱

export const isEmail = (s) => {

return /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+((.[a-zA-Z0-9_-]{2,3}){1,2})$/.test(s)

}

2.手机号码

export const isMobile = (s) => {

return /^1[0-9]{10}$/.test(s)

}

3.电话号码

export const isPhone = (s) => {

return /^([0-9]{3,4}-)?[0-9]{7,8}$/.test(s)

}

4.是否url地址

export const isURL = (s) => {

return /^http[s]?:\/\/.*/.test(s)

}

5.是否字符串

export const isString = (o) => {

return Object.prototype.toString.call(o).slice(8, -1) === 'String'

}

6.是否数字

export const isNumber = (o) => {

return Object.prototype.toString.call(o).slice(8, -1) === 'Number'

}

7.是否boolean

export const isBoolean = (o) => {

return Object.prototype.toString.call(o).slice(8, -1) === 'Boolean'

}

8.是否函数

export const isFunction = (o) => {

return Object.prototype.toString.call(o).slice(8, -1) === 'Function'

}

9.是否为null

export const isNull = (o) => {

return Object.prototype.toString.call(o).slice(8, -1) === 'Null'

}

10.是否undefined

export const isUndefined = (o) => {

return Object.prototype.toString.call(o).slice(8, -1) === 'Undefined'

}

11.是否对象

export const isObj = (o) => {

return Object.prototype.toString.call(o).slice(8, -1) === 'Object'

}

12.是否数组

export const isArray = (o) => {

return Object.prototype.toString.call(o).slice(8, -1) === 'Array'

}

13.是否时间

export const isDate = (o) => {

return Object.prototype.toString.call(o).slice(8, -1) === 'Date'

}

14.是否正则

export const isRegExp = (o) => {

return Object.prototype.toString.call(o).slice(8, -1) === 'RegExp'

}

15.是否错误对象

export const isError = (o) => {

return Object.prototype.toString.call(o).slice(8, -1) === 'Error'

}

16.是否Symbol函数

export const isSymbol = (o) => {

return Object.prototype.toString.call(o).slice(8, -1) === 'Symbol'

}

17.是否Promise对象

export const isPromise = (o) => {

return Object.prototype.toString.call(o).slice(8, -1) === 'Promise'

}

18.是否Set对象

export const isSet = (o) => {

return Object.prototype.toString.call(o).slice(8, -1) === 'Set'

} export const ua = 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|sogou 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.是否为PC端

export const isPC = () => {

var userAgentInfo = navigator.userAgent;
var Agents = ["Android", "iPhone",
    "SymbianOS", "Windows Phone",
    "iPad", "iPod"];
var flag = true;
for (var v = 0; v < Agents.length; v++) {
    if (userAgentInfo.indexOf(Agents[v]) > 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.getElementsByTagName('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 const 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 const scrollToTop = () => {

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

}

34.el是否在视口范围内

export const elementIsVisibleInViewport = (el, partiallyVisible = false) => {

const { top, left, bottom, right } = el.getBoundingClientRect();
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.劫持粘贴板

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) // 加上小数部分(如果有小数部分)
{
    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;

}