关于JavaScript常用的工具函数汇总

作者: 子瞻是也 | 来源:发表于2021-10-22 16:07 被阅读0次

前言

随着开发经验的积累，很多人会有自己的常用站点，一些网址收藏，自己造的轮子或者别人的轮子，工具函数库等等。
这里提供一些常用的工具函数，如果你也有一些觉得挺不错的库，欢迎在下方评论💓。

格式化时间戳

export function formatDateTimeStamp(date, fmt) {
    // 格式化时间戳 : formatDateTimeStamp(new Date(time),'yyyy-MM-dd hh:mm:ss')
    if (/(y+)/.test(fmt)) {
        fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length))
    }
    let o = {
        'M+': date.getMonth() + 1,
        'd+': date.getDate(),
        'h+': date.getHours(),
        'm+': date.getMinutes(),
        's+': date.getSeconds()
    }
    for (let k in o) {
        if (new RegExp(`(${k})`).test(fmt)) {
            let str = o[k] + ''
            fmt = fmt.replace(
                RegExp.$1, (RegExp.$1.length === 1) ?
                str :
                padLeftZero(str))
        }
    }
    return fmt
}

function padLeftZero(str) {
    return ('00' + str).substr(str.length);
}

export function parseTime(time, cFormat) {
    if (arguments.length === 0) {
        return null
    }
    const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
    let date
    if (typeof time === 'object') {
        date = time
    } else {
        if ((typeof time === 'string') && (/^[0-9]+$/.test(time))) {
            time = parseInt(time)
        }
        if ((typeof time === 'number') && (time.toString().length === 10)) {
            time = time * 1000
        }
        date = new Date(time)
    }
    const formatObj = {
        y: date.getFullYear(),
        m: date.getMonth() + 1,
        d: date.getDate(),
        h: date.getHours(),
        i: date.getMinutes(),
        s: date.getSeconds(),
        a: date.getDay()
    }
    const time_str = format.replace(/{([ymdhisa])+}/g, (result, key) => {
        const value = formatObj[key]
        // Note: getDay() returns 0 on Sunday
        if (key === 'a') {
            return ['日', '一', '二', '三', '四', '五', '六'][value]
        }
        return value.toString().padStart(2, '0')
    })
    return time_str
}

// for example
// formatDateTimeStamp(new Date(1632744272 * 1000),'yyyy-MM-dd hh:mm:ss') 
// parseTime(1632744272) 
// 输出 ---> 2021-09-27 20:04:32

时间格式化几分钟前几小时前

/**
 * @param {number} time
 * @param {string} option
 * @returns {string}
 */
export function formatTime(time, option) {
    if (('' + time).length === 10) {
        time = parseInt(time) * 1000
    } else {
        time = +time
    }
    const d = new Date(time)
    const now = Date.now()
    const diff = (now - d) / 1000
    if (diff < 30) {
        return '刚刚'
    } else if (diff < 3600) {
        // less 1 hour
        return Math.ceil(diff / 60) + '分钟前'
    } else if (diff < 3600 * 24) {
        return Math.ceil(diff / 3600) + '小时前'
    } else if (diff < 3600 * 24 * 2) {
        return '1天前'
    }
    if (option) {
        return parseTime(time, option)
    } else {
        return (
            d.getMonth() +
            1 +
            '月' +
            d.getDate() +
            '日' +
            d.getHours() +
            '时' +
            d.getMinutes() +
            '分'
        )
    }
}
// for example 
// formatTime(1632600000)
// 测试时间 ---> 2021-09-27 20:25:30 
// 输出 ---> 一天前

/**
 * Show plural label if time is plural number
 * @param {number} time
 * @param {string} label
 * @return {string}
 */
function pluralize(time, label) {
    if (time === 1) {
        return time + label + ' ago'
    }
    return time + label + 's' + ' ago'
}

/**
 * @param {number} time
 */
export function timeAgo(time) {
    const between = Date.now() / 1000 - Number(time)
    if (between < 3600) {
        return pluralize(~~(between / 60), ' minute')
    } else if (between < 86400) {
        return pluralize(~~(between / 3600), ' hour')
    } else {
        return pluralize(~~(between / 86400), ' day')
    }
}
// for example 
// timeAgo(1632200000)
// 测试时间 ---> 2021-09-27 20:45:46 
// 输出 ---> 6 days ago

url参数转为对象

/**
 * @param {string} url
 * @returns {Object}
 */
export function getQueryObject(url) {
    url = url == null ? window.location.href : url
    const search = url.substring(url.lastIndexOf('?') + 1)
    const obj = {}
    const reg = /([^?&=]+)=([^?&=]*)/g
    search.replace(reg, (rs, $1, $2) => {
        const name = decodeURIComponent($1)
        let val = decodeURIComponent($2)
        val = String(val)
        obj[name] = val
        return rs
    })
    return obj
}
// or
/**
 * @param {string} url
 * @returns {Object}
 */
export function param2Obj(url) {
    const search = url.split('?')[1]
    if (!search) {
        return {}
    }
    return JSON.parse(
        '{"' +
        decodeURIComponent(search)
        .replace(/"/g, '\\"')
        .replace(/&/g, '","')
        .replace(/=/g, '":"')
        .replace(/\+/g, ' ') +
        '"}'
    )
}
// for example 
// getQueryObject('http://xxxxxx/index?id=123')
// param2Obj('http://xxxxxx/index?id=123')
// 输出 ---> {id: "123"}

对象序列化【对象转url参数】

/**
 * @param {Array} actual
 * @returns {Array}
 */
function cleanArray(actual) {
    const newArray = []
    for (let i = 0; i < actual.length; i++) {
        if (actual[i]) {
            newArray.push(actual[i])
        }
    }
    return newArray
}
/**
 * @param {Object} obj
 * @returns {Array}
 */
export function param(obj) {
    if (!obj) return ''
    return cleanArray(
        Object.keys(obj).map(key => {
            if (obj[key] === undefined) return ''
            return encodeURIComponent(key) + '=' + encodeURIComponent(obj[key])
        })
    ).join('&')
}

// or

export function stringfyQueryStr(obj) { 
    if (!obj) return '';
    let pairs = [];
    for (let key in obj) {
        let value = obj[key];
        if (value instanceof Array) {
            for (let i = 0; i < value.length; ++i) {
                pairs.push(encodeURIComponent(key + '[' + i + ']') + '=' + encodeURIComponent(value[i]));
            }
            continue;
        }
        pairs.push(encodeURIComponent(key) + '=' + encodeURIComponent(obj[key]));
    }
    return pairs.join('&');
}

// for example

param({name:'1111',sex:'wwww'})
stringfyQueryStr({name:'1111',sex:'wwww'})
// ---> 输出 name=1111&sex=wwww

本地存储

export const store = { // 本地存储
    set: function(name, value, day) { // 设置
        let d = new Date()
        let time = 0
        day = (typeof(day) === 'undefined' || !day) ? 1 : day // 时间,默认存储1天
        time = d.setHours(d.getHours() + (24 * day)) // 毫秒
        localStorage.setItem(name, JSON.stringify({
            data: value,
            time: time
        })) 
    },
    get: function(name) { // 获取
        let data = localStorage.getItem(name)
        if (!data) {
            return null
        }
        let obj = JSON.parse(data)
        if (new Date().getTime() > obj.time) { // 过期
            localStorage.removeItem(name)
            return null
        } else {
            return obj.data
        }
    },
    clear: function(name) { // 清空
        if (name) { // 删除键为name的缓存
            localStorage.removeItem(name)
        } else { // 清空全部
            localStorage.clear()
        }
    }
}

cookie操作

export const cookie = { // cookie操作【set，get，del】
    set: function(name, value, day) {
        let oDate = new Date()
        oDate.setDate(oDate.getDate() + (day || 30))
        document.cookie = name + '=' + value + ';expires=' + oDate + "; path=/;"
    },
    get: function(name) {
        let str = document.cookie
        let arr = str.split('; ')
        for (let i = 0; i < arr.length; i++) {
            let newArr = arr[i].split('=')
            if (newArr[0] === name) {
                return newArr[1]
            }
        }
    },
    del: function(name) {
        this.set(name, '', -1)
    }
}

数字格式化单位

/**
 * Number formatting
 * like 10000 => 10k
 * @param {number} num
 * @param {number} digits
 */
export function numberFormatter(num, digits) {
    const si = [{
            value: 1E18,
            symbol: 'E'
        },
        {
            value: 1E15,
            symbol: 'P'
        },
        {
            value: 1E12,
            symbol: 'T'
        },
        {
            value: 1E9,
            symbol: 'G'
        },
        {
            value: 1E6,
            symbol: 'M'
        },
        {
            value: 1E3,
            symbol: 'k'
        }
    ]
    for (let i = 0; i < si.length; i++) {
        if (num >= si[i].value) {
            return (num / si[i].value).toFixed(digits).replace(/\.0+$|(\.[0-9]*[1-9])0+$/, '$1') + si[i].symbol
        }
    }
    return num.toString()
}

数字千位过滤

/**
 * 10000 => "10,000"
 * @param {number} num
 */
export function toThousandFilter(num) {
    let targetNum = (num || 0).toString()
    if (targetNum.includes('.')) {
        let arr = num.split('.')
        return arr[0].replace(/^-?\d+/g, m => m.replace(/(?=(?!\b)(\d{3})+$)/g, ',')) + '.' + arr[1]
    } else {
        return targetNum.replace(/^-?\d+/g, m => m.replace(/(?=(?!\b)(\d{3})+$)/g, ','))
    }
}

过滤成版本号

/**
 * version filter
 * 50397188 => 3.1.0.4
 * @param {number} versions
 */
export function versionFilter(versions) {
    let v0 = (versions & 0xff000000) >> 24
    let v1 = (versions & 0xff0000) >> 16
    let v2 = (versions & 0xff00) >> 8
    let v3 = versions & 0xff
    return `${v0}.${v1}.${v2}.${v3}`
}

首字母大写

/**
 * Upper case first char
 * @param {String} string
 */
export function uppercaseFirst(string) {
    return string.charAt(0).toUpperCase() + string.slice(1)
}

class骚操作


/**
 * Check if an element has a class
 * @param {HTMLElement} elm
 * @param {string} cls
 * @returns {boolean}
 */
export function hasClass(ele, cls) {
    return !!ele.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'))
}

/**
 * Add class to element
 * @param {HTMLElement} elm
 * @param {string} cls
 */
export function addClass(ele, cls) {
    if (!hasClass(ele, cls)) ele.className += ' ' + cls
}

/**
 * Remove class from element
 * @param {HTMLElement} elm
 * @param {string} cls
 */
export function removeClass(ele, cls) {
    if (hasClass(ele, cls)) {
        const reg = new RegExp('(\\s|^)' + cls + '(\\s|$)')
        ele.className = ele.className.replace(reg, ' ')
    }
}

文本复制功能

const copyTxt = function(text, fn) { // 复制功能
    if (typeof document.execCommand !== 'function') {
        console.log('复制失败，请长按复制')
        return
    }
    var dom = document.createElement('textarea')
    dom.value = text
    dom.setAttribute('style', 'display: block;width: 1px;height: 1px;')
    document.body.appendChild(dom)
    dom.select()
    var result = document.execCommand('copy')
    document.body.removeChild(dom)
    if (result) {
        console.log('复制成功')
        typeof fn === 'function' && fn()
        return
    }
    if (typeof document.createRange !== 'function') {
        console.log('复制失败，请长按复制')
        return
    }
    var range = document.createRange()
    var div = document.createElement('div')
    div.innerhtml = text
    div.setAttribute('style', 'height: 1px;fontSize: 1px;overflow: hidden;')
    document.body.appendChild(div)
    range.selectNode(div)
    var selection = window.getSelection()
    console.log(selection)
    if (selection.rangeCount > 0) {
        selection.removeAllRanges()
    }
    selection.addRange(range)
    document.execCommand('copy')
    typeof fn === 'function' && fn()
    console.log('复制成功')
}

判断是否是一个数组

export const castArray = value => (Array.isArray(value) ? value : [value])

// Or
export const castArray = arr=>  Object.prototype.toString.call(arr) === '[object Array]'

判断是否是一个空数组

export const isEmpty = (arr) => !Array.isArray(arr) || arr.length === 0
// for example
// isEmpty([]); // true
// isEmpty([1, 2, 3]); // false

克隆一个数组

/**
 * @param {Array} arr 
 */
const clone = (arr) => arr.slice(0);

// Or
const clone = (arr) => [...arr];

// Or
const clone = (arr) => Array.from(arr);

// Or
const clone = (arr) => arr.map((x) => x);

// Or
const clone = (arr) => JSON.parse(JSON.stringify(arr));

// Or
const clone = (arr) => arr.concat([]);

数组去重

/**
 * @param {Array} arr
 * @returns {Array}
 */
export const uniqueArray = (arr) => Array.from(new Set(arr)) 
// Or
export const uniqueArray = (arr) => arr.filter((el, i, array) => array.indexOf(el) === i)
// Or
export const uniqueArray = (arr) => arr.reduce((acc, el) => (acc.includes(el) ? acc : [...acc, el]), [])

是否为PC端

export const isPC = function() { // 是否为PC端
    let userAgentInfo = navigator.userAgent
    let Agents = ['Android', 'iPhone', 'SymbianOS', 'Windows Phone', 'iPad', 'iPod']
    let flag = true
    for (let v = 0; v < Agents.length; v++) {
        if (userAgentInfo.indexOf(Agents[v]) > 0) {
            flag = false
            break
        }
    }
    return flag
}

判断是否为微信

export const isWx = () => { // 判断是否为微信
    var ua = window.navigator.userAgent.toLowerCase()
    if (ua.match(/MicroMessenger/i) === 'micromessenger') {
        return true
    }
    return false
}

设备判断：android、ios、web

export const isDevice = function() { // 判断是android还是ios还是web
    var ua = navigator.userAgent.toLowerCase()
    if (ua.match(/iPhone\sOS/i) === 'iphone os' || ua.match(/iPad/i) === 'ipad') { // ios
        return 'iOS'
    }
    if (ua.match(/Android/i) === 'android') {
        return 'Android'
    }
    return 'Web'
}

常见正则校验

/*正则匹配*/
export const normalReg = (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 'positiveInteger':  //正整数
            return /^[1-9]\d*$/.test(str);
        case 'price':  //价格
            return /(^[1-9]\d*(\.\d{1,2})?$)|(^0(\.\d{1,2})?$)/.test(str);//价格非0则去掉'?'
        case 'english': //英文
            return /^[a-zA-Z]+$/.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;
    }
}

去除字符串空格

/**
 * @param {str} str
 * @param {Number} type 1 -> 所有空格  2 -> 前后空格  3 -> 前空格 4 -> 后空格
 * @returns {String} 
 */
export const trim = function(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
    }
}

过滤html代码

export const filterTag = function(str) { // 过滤html代码(把<>转换)
    str = str.replace(/&/ig, '&')
    str = str.replace(/</ig, '<')
    str = str.replace(/>/ig, '>')
    str = str.replace(' ', ' ')
    return str
}

生成随机数范围

export const random = function(min, max) { // 生成随机数范围
    if (arguments.length === 2) {
        return Math.floor(min + Math.random() * ((max + 1) - min))
    } else {
        return null
    }
}

判断图片加载完成

export const imgLoadAll = function(arr, callback) { // 图片加载
    let arrImg = []
    for (let i = 0; i < arr.length; i++) {
        let img = new Image()
        img.src = arr[i]
        img.onload = function() {
            arrImg.push(this)
            if (arrImg.length == arr.length) {
                callback && callback()
            }
        }
    }
}

光标所在位置插入字符

export const insertAtCursor = function(dom, val) { // 光标所在位置插入字符
    if (document.selection) {
        dom.focus()
        let sel = document.selection.createRange()
        sel.text = val
        sel.select()
    } else if (dom.selectionStart || dom.selectionStart == '0') {
        let startPos = dom.selectionStart
        let endPos = dom.selectionEnd
        let restoreTop = dom.scrollTop
        dom.value = dom.value.substring(0, startPos) + val + dom.value.substring(endPos, dom.value.length)
        if (restoreTop > 0) {
            dom.scrollTop = restoreTop
        }
        dom.focus()
        dom.selectionStart = startPos + val.length
        dom.selectionEnd = startPos + val.length
    } else {
        dom.value += val
        dom.focus()
    }
}

图片地址转base64

export const getBase64 = function(img) { 
    //传入图片路径，返回base64，使用getBase64(url).then(function(base64){},function(err){}); 
    let getBase64Image = function(img, width, height) { 
    //width、height调用时传入具体像素值，控制大小,不传则默认图像大小
        let canvas = document.createElement("canvas");
        canvas.width = width ? width : img.width;
        canvas.height = height ? height : img.height;
        let ctx = canvas.getContext("2d");
        ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
        let dataURL = canvas.toDataURL();
        return dataURL;
    }
    let image = new Image();
    image.crossOrigin = '';
    image.src = img;
    let deferred = $.Deferred();
    if (img) {
        image.onload = function() {
            deferred.resolve(getBase64Image(image));
        }
        return deferred.promise();
    }
}

base64图片下载功能

export const downloadFile  = (base64, fileName) => {
    let base64ToBlob = (code) => {
        let parts = code.split(';base64,');
        let contentType = parts[0].split(':')[1];
        let raw = window.atob(parts[1]);
        let rawLength = raw.length;
        let uInt8Array = new Uint8Array(rawLength);
        for (let i = 0; i < rawLength; ++i) {
            uInt8Array[i] = raw.charCodeAt(i);
        }
        return new Blob([uInt8Array], {
            type: contentType
        });
    };
    let aLink = document.createElement('a');
    let blob = base64ToBlob(base64); //new Blob([content]);
    let evt = document.createEvent("HTMLEvents");
    evt.initEvent("click", true, true); //initEvent不加后两个参数在FF下会报错  事件类型，是否冒泡，是否阻止浏览器的默认行为
    aLink.download = fileName;
    aLink.href = URL.createObjectURL(blob);
    aLink.click();
}

浏览器是否支持webP格式图片

export const webPBool = () => !![].map && document.createElement('canvas').toDataURL('image/webp').indexOf('data:image/webp') == 0

H5软键盘缩回、弹起回调

/* 当软件键盘弹起会改变当前 window.innerHeight
监听这个值变化 [downCb 当软键盘弹起后，缩回的回调,upCb 当软键盘弹起的回调] */
export function(downCb, upCb) { 
    var clientHeight = window.innerHeight
    downCb = typeof downCb === 'function' ? downCb : function() {}
    upCb = typeof upCb === 'function' ? upCb : function() {}
    window.addEventListener('resize', () => {
        var height = window.innerHeight
        if (height === clientHeight) {
            downCb()
        }
        if (height < clientHeight) {
            upCb()
        }
    })
}

对象属性剔除

/** 
* @param {object} object 
* @param {string[]} props 
* @return {object} 
*/
function omit(object, props=[]){  
    let res = {}  
    Object.keys(object).forEach(key=>{    
        if(props.includes(key) === false){      
            res[key] = typeof object[key] === 'object' && object[key] !== null ? jsON.parse(jsON.stringify(object[key])) : object[key]    
        }  
    })         
    return res
}

// for example
let data = {  id: 1,  title: '12345',  name: '男'}
omit(data, ['id']) 
// data ---> {title: 'xxx', name: '男'}

深拷贝

/**
 * This is just a simple version of deep copy
 * Has a lot of edge cases bug
 * If you want to use a perfect deep copy, use lodash's _.cloneDeep
 * @param {Object} source
 * @returns {Object}
 */
export function deepClone(source) {
    if (!source && typeof source !== 'object') {
        throw new Error('error arguments', 'deepClone')
    }
    const targetObj = source.constructor === Array ? [] : {}
    Object.keys(source).forEach(keys => {
        if (source[keys] && typeof source[keys] === 'object') {
            targetObj[keys] = deepClone(source[keys])
        } else {
            targetObj[keys] = source[keys]
        }
    })
    return targetObj
}

函数防抖

export function debounce(func, wait, immediate) {
    let timeout, args, context, timestamp, result
    const later = function() {
        // 据上一次触发时间间隔
        const last = +new Date() - timestamp

        // 上次被包装函数被调用时间间隔 last 小于设定时间间隔 wait
        if (last < wait && last > 0) {
            timeout = setTimeout(later, wait - last)
        } else {
            timeout = null
            // 如果设定为immediate===true，因为开始边界已经调用过了此处无需调用
            if (!immediate) {
                result = func.apply(context, args)
                if (!timeout) context = args = null
            }
        }
    }
    return function(...args) {
        context = this
        timestamp = +new Date()
        const callNow = immediate && !timeout
        // 如果延时不存在，重新设定延时
        if (!timeout) timeout = setTimeout(later, wait)
        if (callNow) {
            result = func.apply(context, args)
            context = args = null
        }
        return result
    }
}

函数节流

/**
 * @param {Function} func 目标函数
 * @param {Number} wait  延迟执行毫秒数
 * @param {Number} type  type 1 表时间戳版，2 表定时器版
 */
export function(func, wait ,type) { 
    if(type===1){
        let previous = 0;
    }else if(type===2){
        let timeout;
    }
    return function() {
        let context = this;
        let args = arguments;
        if(type===1){
            let now = Date.now();
            if (now - previous > wait) {
                func.apply(context, args);
                previous = now;
            }
        }else if(type===2){
            if (!timeout) {
                timeout = setTimeout(() => {
                    timeout = null;
                    func.apply(context, args)
                }, wait)
            }
        }
    }
}

关于JavaScript常用的工具函数汇总

前言

格式化时间戳

时间格式化 几分钟前 几小时前

url参数转为对象

对象序列化【对象转url参数】

本地存储

cookie操作

数字格式化单位

数字千位过滤

过滤成版本号

首字母大写

class骚操作

文本复制功能

判断是否是一个数组

判断是否是一个空数组

克隆一个数组

数组去重

是否为PC端

判断是否为微信

设备判断：android、ios、web

常见正则校验

去除字符串空格

过滤html代码

生成随机数范围

判断图片加载完成

光标所在位置插入字符

图片地址转base64

base64图片下载功能

浏览器是否支持webP格式图片

H5软键盘缩回、弹起回调

对象属性剔除

深拷贝

函数防抖

函数节流

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时间格式化几分钟前几小时前