【js小技巧】utils集合

背景

utils的一些函数，可以直接复制使用，简单方便，没必要每次自己写后者网上搜。

parseTime

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export function parseTime(time, cFormat) {
  if (arguments.length === 0) {
    return null
  }
  const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
  let date
  if (!time || time === 0) {
    return '--'
  }
  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
}

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从url上获取参数

getQueryObject

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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
}

---

222

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export function param(json) {
  if (!json) return ''
  return cleanArray(
    Object.keys(json).map(key => {
      if (json[key] === undefined) return ''
      return encodeURIComponent(key) + '=' + encodeURIComponent(json[key])
    })
  ).join('&')
}

---

333

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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, ' ') +
    '"}'
  )
}

---

deepClone

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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
}

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uuid

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export function uuid2(len, radix = 16) {
  var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('')
  var uuid = []
  var i
  radix = radix || chars.length

  if (len) {
    // Compact form
    for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random() * radix]
  } else {
    // rfc4122, version 4 form
    var r

    // rfc4122 requires these characters
    uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-'
    uuid[14] = '4'

    // Fill in random data.  At i==19 set the high bits of clock sequence as
    // per rfc4122, sec. 4.1.5
    for (i = 0; i < 36; i++) {
      if (!uuid[i]) {
        r = 0 | Math.random() * 16
        uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r]
      }
    }
  }

  return uuid.join('')
}

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md5

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var crypto = require('crypto')
export function md5(content) {
  return crypto.createHash('md5').update(content).digest('hex')
}

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isJson

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export function isJSON(str) {
  if (typeof str === 'string') {
    try {
      var obj = JSON.parse(str)
      if (typeof obj === 'object' && obj) {
        return true
      } else {
        return false
      }
    } catch (e) {
      console.log('error：' + str + '!!!' + e)
      return false
    }
  }
  console.log('It is not a string!')
}

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cache

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export const getSyncData = (key) => {
  const keyname = 'admin::' + key
  const result = window.localStorage.getItem(keyname)
  return SerializerJSON.parse(result)
}

export const setSyncData = (key, data) => {
  const keyname = 'admin::' + key
  const dataStr = SerializerJSON.stringify(data)
  return window.localStorage.setItem(keyname, dataStr)
}

export const delSyncData = (key) => {
  const keyname = 'admin::' + key
  delete Cache[keyname]
  return window.localStorage.removeItem(keyname)
}

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