60个前端常用的实现方法-技术圈

来源 | https://github.com/hangjob/vue-admin/blob/master/src/utils/util.js

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;}

本文完〜