让你事半功倍的JS utils工具函数1

export const dateRegExp = (time, strText) => {
  const date = new Date(time)
  if (/(y+)/.test(strText)) {
    strText = strText.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length))
  }
  const dataType = {
    'M+': date.getMonth() + 1,
    'd+': date.getDate(),
    'h+': date.getHours(),
    'm+': date.getMinutes(),
    's+': date.getSeconds()
  }
  for (const typeKey in dataType) {
    if (new RegExp(`(${typeKey})`).test(strText)) {
      const typeValue = dataType[typeKey] + ''
      strText = strText.replace(RegExp.$1, (RegExp.$1.length === 1 ? typeValue : padLeftZero(typeValue)))
    }
  }
  return strText
}

export function formatPassTime(startTime) {
    var currentTime = Date.parse(new Date()),
        time = currentTime - startTime,
        day = parseInt(time / (1000 * 60 * 60 * 24)),
        hour = parseInt(time / (1000 * 60 * 60)),
        min = parseInt(time / (1000 * 60)),
        month = parseInt(day / 30),
        year = parseInt(month / 12);
    if (year) return year + "年前"
    if (month) return month + "个月前"
    if (day) return day + "天前"
    if (hour) return hour + "小时前"
    if (min) return min + "分钟前"
    else return '刚刚'
}

export function isSameDay(d1, d2) {
    if (!d2) {
        d2 = new Date();
    }
    var d1_year = d1.getFullYear(),
        d1_month = d1.getMonth() + 1,
        d1_date = d1.getDate();
    var d2_year = d2.getFullYear(),
        d2_month = d2.getMonth() + 1,
        d2_date = d2.getDate()
    return d1_date === d2_date && d1_month === d2_month && d1_year === d2_year;
}

export function isTodayDate(time) {
    if (new Date(time).toDateString() === new Date().toDateString()) {
        return true;
    }
    return false;
}

export function parseQueryString(url) {
    url = url ? url:window.location.search ;
    let search = url[0] === '?' ? url : url.substring(url.lastIndexOf('?')); 
    let q = {};
    search.replace(/([^?&=]+)=([^&]+)/g, (_, k, v) => q[k] = decodeURIComponent(v));
    return q;
}

export function getQueryString(name) {
  const reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)', 'i')
  const r = window.location.search.substr(1).match(reg)
  if (r !== null) {
    return decodeURI(r[2])
  }
  return null
}

export getHashQueryString = (key) => {
  const after = window.location.href.split('?')[1]
  if (after) {
    const reg = new RegExp(`(^|&)${  key  }=([^&]*)(&|$)`)
    const r = after.match(reg)
    if (r != null) {
      return decodeURIComponent(r[2])
    }
    return null
  }
  return null
}

export function serialize(query, encode = false) {
  return Object.keys(query)
    .map((key) => `${key}=${encode ? encodeURIComponent(query[key]) : query[key]}`)
    .join('&')
}

export function isSupportIntersection() {
  return (
    'IntersectionObserver' in window &&
    'IntersectionObserverEntry' in window &&
    'intersectionRatio' in window.IntersectionObserverEntry.prototype
  )
}

export const isIOS = (() => {
  return /ios|iphone|ipad|ipod/.test(navigator.userAgent.toLowerCase())
})()

export const isAndroid = (() {
  return /android/.test(navigator.userAgent.toLowerCase())
})()

export function isWeixin() {
  var ua = navigator.userAgent.toLowerCase();
  return (ua.match(/MicroMessenger/i) == "micromessenger")
}

export function checkSupportWebp() {
  return (
    document
      .createElement('canvas')
      .toDataURL('image/webp')
      .indexOf('data:image/webp') === 0
  )
}
export function checkSupportWebp2() {
  var img = new Image();
  img.onload = img.onerror = (event) => {
    return event && event.type === "load" ? img.width == 1 : false;
  };
  img.src = "data:image/webp;base64,UklGRiQAAABXRUJQVlA4IBgAAAAwAQCdASoBAAEAAwA0JaQAA3AA/vuUAAA=";
}

export function isMobile() {
    const agent = navigator.userAgent;
    const k = ["android", "iphone", "ipod", "ipad", "windows phone", "mqqbrowser"];
    let flag = false;
    // Windows
    if (agent.indexOf("Windows NT") < 0 || (agent.indexOf("Windows NT") >= 0 && agent.indexOf("compatible; MSIE 9.0;") >= 0)) {
        // Mac PC
        if (agent.indexOf("Windows NT") < 0 && agent.indexOf("Macintosh") < 0) {
            for (let item of k) {
                if (agent.indexOf(item) >= 0) {
                    flag = true;
                    break;
                }
            }
        }
    }
    return flag;
}

export function checkFileName(fileName, list) {
    if (typeof fileName !== 'string') return;
    let name = fileName.toLowerCase();
    return list.some(i => name.endsWith(`.${i}`) === true)
}
export function isImage(fileName) {
    return checkFileName(fileName, ['png', 'jpeg', 'jpg', 'png', 'bmp'])
}
export function isH5Video(fileName) {
    return checkFileName(fileName, ['mp4', 'webm', 'ogg'])
}
export function isPdf(fileName) {
    return checkFileName(fileName, ['pdf'])
}
export function isWord(fileName) {
    return checkFileName(fileName, ['doc', 'docx'])
}
export function isExcel(fileName) {
    return checkFileName(fileName, ['xlsx', 'xls'])
}

export function is(subject, type) {
  return Object.prototype.toString.call(subject).substr(8, type.length).toLowerCase() === type
}
export function isArray(subject) {
  return Array.isArray(subject)
}
export function isObject(subject) {
  return is(subject, 'object')
}
...
export function isNum(subject) {
  return !isNaN(subject) && is(subject, 'number')
}