tnbapp/src/assets/js/utils.js

// 工具类

// 随机获取数组中的num个元素并返回新数组
export function getArrayItems(arr, num) {
  const newArr = []
  for (let i = 0; i <= num - 1; i++) {
    // 生成数组长度范围内的随机数
    const index = Math.floor(Math.random() * arr.length)
    newArr[i] = arr.splice(index, 1)[0]
  }
  return newArr
}

// 23000 =》 2.3万
export function handleVisited(visited) {
  // console.log(visited);
  if (visited >= 10000) {
    var s = Math.floor(visited / 10000)
    var s2 = Math.floor(visited % 10000 / 1000)
    visited = s + '.' + s2 + '万'
  }
  return visited
}

// 时间的转换
export function getDate(pretime) {
  const minute = 1000 * 60
  const hour = minute * 60
  const day = hour * 24
  const month = day * 30
  // 将时间转化为时间戳
  pretime = pretime.replace(/\-/g, '/')
  const time = new Date(pretime).getTime()
  // 获取当前时间戳
  const now = new Date().getTime()
  const subTime = now - time
  const monthC = subTime / month
  const weekC = subTime / (7 * day)
  const dayC = subTime / day
  const hourC = subTime / hour
  const minC = subTime / minute

  if (monthC >= 1) {
    return parseInt(monthC) + '个月前'
  } else if (weekC >= 1) {
    return parseInt(weekC) + '周前'
  } else if (dayC >= 1) {
    return parseInt(dayC) + '天前'
  } else if (hourC >= 1) {
    return parseInt(hourC) + '小时前'
  } else if (minC >= 1) {
    return parseInt(minC) + '分钟前'
  } else {
    return '刚刚'
  }
}

// 获取唯一的id
export function getUUid() {
  var s = []
  var hexDigits = '0123456789abcdef'
  for (var i = 0; i < 36; i++) {
    s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1)
  }
  s[14] = '4' // bits 12-15 of the time_hi_and_version field to 0010
  s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1) // bits 6-7 of the clock_seq_hi_and_reserved to 01
  s[8] = s[13] = s[18] = s[23] = '-'

  var uuid = s.join('')
  return uuid
}

// 时间格式化
export function formatDate(date, fmt) {
  if (/(y+)/.test(fmt)) {
    fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length))
  }
  const o = {
    'M+': date.getMonth() + 1,
    'd+': date.getDate(),
    'h+': date.getHours(),
    'm+': date.getMinutes(),
    's+': date.getSeconds()
  }
  for (const k in o) {
    if (new RegExp(`(${k})`).test(fmt)) {
      const 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)
}