常用js转换

获取当前日期字符串
function formatDateTime() {
    var date = new Date();
    var y = date.getFullYear();
    var m = date.getMonth() + 1;
    m = m < 10 ? ('0' + m) : m;
    var d = date.getDate();
    d = d < 10 ? ('0' + d) : d;
    var h = date.getHours();
    h = h < 10 ? ('0' + h) : h;
    var minute = date.getMinutes();
    var second = date.getSeconds();
    minute = minute < 10 ? ('0' + minute) : minute;
    second = second < 10 ? ('0' + second) : second;
    return{
        'ymd':y + '-' + m + '-' + d,
        'ymdhm':y + '-' + m + '-' + d + ' ' + h + ':' + minute,

    } 
}

/^1[3456789]d{9}$/

export function checkMobile(mobile) {

    mobile = mobile.toString();

    var index1 = mobile.substring(0, 1);

    var index2 = mobile.substring(0, 2);

    if (index2 == '11' || index2 == '12' || index1 !== '1' || mobile.length !== 11) {

        return false;

    } else {

        return true;

    }

}

export function transData(list, idstr, pidstr) {

  var result = []; var temp = {}

  // 创建一个对象 以每个元素的idstr建立索引

  for (var i = 0; i < list.length; i++) {

    temp[list[i][idstr]] = list[i]// 将nodes数组转成对象类型

  }

  for (var j = 0; j < list.length; j++) {

    var tempVp = temp[list[j][pidstr]] // 获取每一个子对象的父对象

    if (tempVp) { // 判断父对象是否存在，如果不存在直接将对象放到第一层

      if (!tempVp['children']) tempVp['children'] = []// 如果父元素的nodes对象不存在，则创建数组

      tempVp['children'].push(list[j])// 将本对象压入父对象的nodes数组

    } else {

      result.push(list[j])// 将不存在父对象的对象直接放入一级目录

    }

  }

  return result

}

// base64转成二进制
export function dataURItoBlob(dataurl) {
  var arr = dataurl.split(',')
  // 注意base64的最后面中括号和引号是不转译的
  var _arr = arr[1].substring(0, arr[1].length - 2)
  var mime = arr[0].match(/:(.*?);/)[1]
  var bstr = atob(_arr)
  var n = bstr.length
  var u8arr = new Uint8Array(n)
  while (n--) {
    u8arr[n] = bstr.charCodeAt(n)
  }
  return new Blob([u8arr], {
    type: mime
  })
}


// 图片Url转成Base64
export function convertImgToBase64(url, callback, outputFormat) {
  var canvas = document.createElement('CANVAS')
  var ctx = canvas.getContext('2d')
  var img = new Image()
  img.crossOrigin = 'Anonymous'
  img.onload = function() {
    canvas.height = img.height
    canvas.width = img.width
    ctx.drawImage(img, 0, 0)
    var dataURL = canvas.toDataURL(outputFormat || 'image/png')
    callback.call(this, dataURL)
    canvas = null
  }
  img.src = url
}



// base64 转 file 对象
export function dataURLtoFile(dataURL, fileName, fileType) {
  var arr = dataURL.split(','); var mime = arr[0].match(/:(.*?);/)[1]
  var bstr = atob(arr[1]); var n = bstr.length; var u8arr = new Uint8Array(n)
  while (n--) {
    u8arr[n] = bstr.charCodeAt(n)
  }
  return new File([u8arr], fileName, { type: fileType || 'image/jpg' })
}

storage.js

var storage = {
  set(key, value) {
    localStorage.setItem(key, JSON.stringify(value))
  },
  get(key) {
    return localStorage.getItem(key)
  },
  remove(key) {
    localStorage.removeItem(key)
  },
  clear() {
    localStorage.clear()
  }
}


export default storage

 

 

export function parseTime(time, cFormat) {
  if (arguments.length === 0 || !time) {
    return null
  }
  const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
  let date
  if (typeof time === 'object') {
    date = time
  } else {
    if ((typeof time === 'string')) {
      if ((/^[0-9]+$/.test(time))) {
        // support "1548221490638"
        time = parseInt(time)
      } else {
        // support safari
        // https://stackoverflow.com/questions/4310953/invalid-date-in-safari
        time = time.replace(new RegExp(/-/gm), '/')
      }
    }


    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
}

 

 

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'
    )
  }
}