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实用工具函数

datas
发布时间
times41 min read
# Javascript# 工具

图片丢失

1. 数字操作

（1）生成指定范围随机数

export const randomNum = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min

（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)
}

export const setCookie = (key, value, expire) => {
  const d = new Date()
  d.setDate(d.getDate() + expire)
  document.cookie = `${key}=${value};expires=${d.toUTCString()}`
}

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
}

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）校验是否为中国大陆的邮政编码

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）校验是否为中国大陆手机号

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
}