src/utils/index.js

// import CryptoJS from "crypto-js"
import { JSEncrypt } from 'jsencrypt'
const encryptKey = "WfJTKO9S4eLkrPz2JKrAnzdb"
const encryptIV = "D076D35C"
/**
 * 登录密码加密，公钥直接写死在方法里
 * @param data： 待加密数据
 * @returns 加密结果
 */
export function encryptLoginPassword(data) {
  const secret = 'MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAjh2ei17z5k2r4VzbqoSCE6RmYzWySJTgVQYulgfVM+vqcDoUE4cFB4XCFA2lHWjjpsuJP1EtwKlvUgxo5okr3x/a88o8eERxBynnVQZbEYpKteW5aqSEb/g1yPLWnKV88b/ED445ITYbZZuInRo5lkCvd6QEjL6d2Fch6mEo5awYXC4/S4BJf9YlYRhGzR7wpiXCLvyBHQ4iSIIDNpmrPBPQzGP0rx09aDu54kz/42CR6SX2OqXSi4ZoieqkPFl/iuX4RoD/NKKR+haDn1UzoD3k1WzHSTBFFs27rxRpxfBUZzfXQeskgKyw/Slcl3jUFizczsY4CLgTRrfey48Q6QIDAQAB';
  // 新建JSEncrypt对象
  let encryptor = new JSEncrypt();
  // 设置公钥
  encryptor.setPublicKey(secret);
  // 加密数据
  return encryptor.encrypt(data);
}
/**
* 对称加密
* @param secret：加密公钥
* @param data： 待加密数据
* @returns 加密结果
*/
export function encryptData(secret, data) {
  // 新建JSEncrypt对象
  let encryptor = new JSEncrypt();
  // 设置公钥
  encryptor.setPublicKey(secret);
  // 加密数据
  return encryptor.encrypt(data);
}
// 深度复制
export function deepClone(obj) {
  let result = Array.isArray(obj) ? [] : {}
  for (let key in obj) {
    if (obj.hasOwnProperty(key)) {
      if (typeof obj[key] === "object") {
        result[key] = deepClone(obj[key])
      } else {
        result[key] = obj[key]
      }
    }
  }
  return result
}
// // 3DES加密
// export function desEncrypt (str, key = encryptKey, iv = encryptIV) {
//   var cryptoKey = CryptoJS.enc.Utf8.parse(key)
//   var cryptoIv = CryptoJS.enc.Utf8.parse(iv.substr(0, 8))
//   var encodeStr = CryptoJS.TripleDES.encrypt(str, cryptoKey, {
//     iv: cryptoIv,
//     mode: CryptoJS.mode.CBC,
//     padding: CryptoJS.pad.Pkcs7
//   })
//   return encodeStr.toString()
// }
// // 3DES解密
// export function desDecrypt (str, key = encryptKey, iv = encryptIV) {
//   var cryptoKey = CryptoJS.enc.Utf8.parse(key)
//   var cryptoIv = CryptoJS.enc.Utf8.parse(iv.substr(0, 8))
//   var decryptStr = CryptoJS.TripleDES.decrypt(str, cryptoKey, {
//     iv: cryptoIv,
//     mode: CryptoJS.mode.CBC,
//     padding: CryptoJS.pad.Pkcs7
//   })
//   return decryptStr.toString(CryptoJS.enc.Utf8)
// }
// 随机生成由字母+数字的字符串
export function randomWord(randomFlag, min, max) {
  // randomFlag: Boolean 是否随机个数
  // min 最少个数
  // max 最大个数
  var str = ""
  var range = min
  var arr = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"]
  // 随机产生
  if (randomFlag) {
    range = Math.round(Math.random() * (max - min)) + min
  }
  var pos = ""
  for (var i = 0; i < range; i++) {
    pos = Math.round(Math.random() * (arr.length - 1))
    str += arr[pos]
  }
  return str
}
// 判断数组中是否存在相同值
export function hasRepeatValue(arr, key = null) {
  if (key) arr = arr.map(d => d[key])
  if (arr.length) {
    let nameNum = arr.reduce((pre, cur) => {
      if (cur in pre) {
        pre[cur]++
      } else {
        pre[cur] = 1
      }
      return pre
    }, {})
    return Object.values(nameNum).findIndex(d => d > 1) < 0
  }
  return true
}
// 获取cookie值
export function getCookie(name, defaultValue) {
  const result = new RegExp("(^| )" + name + "=([^;]*)(;|$)")
  return result[0] === document.cookie.match(result[1]) ? unescape(result[0][2]) : defaultValue
}
/**
 * base64转化unicode
 */
export function b64DecodeUnicode(str) {
  let uni;
  try {
    // atob 经过 base-64 编码的字符串进行解码
    uni = decodeURIComponent(atob(str).split('').map(function (c) {
      return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
    }).join(''));
  } catch (e) { }
  return uni;
}
// base64ToFile
export function base64ToFile(base64Data, tempfilename, contentType) {
  contentType = contentType || ""
  var sliceSize = 1024
  var byteCharacters = atob(base64Data)
  var bytesLength = byteCharacters.length
  var slicesCount = Math.ceil(bytesLength / sliceSize)
  var byteArrays = new Array(slicesCount)
  for (var sliceIndex = 0; sliceIndex < slicesCount; ++sliceIndex) {
    var begin = sliceIndex * sliceSize
    var end = Math.min(begin + sliceSize, bytesLength)
    var bytes = new Array(end - begin)
    for (var offset = begin, i = 0; offset < end; ++i, ++offset) {
      bytes[i] = byteCharacters[offset].charCodeAt(0)
    }
    byteArrays[sliceIndex] = new Uint8Array(bytes)
  }
  var file = new File(byteArrays, tempfilename, { type: contentType })
  return file
}
// 将base64转换为文件
export function dataURLtoFile(dataurl, filename) {
  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: mime })
}
// 将图片转换为Base64
export function getImgToBase64(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(dataURL)
    canvas = null
  }
  img.src = url
}
// 转换级联下拉数据
export function loopOptions(list, option = {}) {
  option = {
    value: "id",
    label: "name",
    children: "children",
    ...option
  }
  if (list instanceof Array && list.length) {
    return list.map((d, i) => {
      d.value = d[option.value] || i + 1
      d.label = d[option.label]
      if (d[option.children]) {
        d[option.children] = loopOptions(d[option.children], option)
      }
      return d
    })
  }
  return []
}
// 通过Id获取级联数据id数组
export function getTreeIds(tree, currentId, key = "id") {
  let parent = {}
  let pid = {}
  const loop = (list, level) => {
    if (list instanceof Array && list.length) {
      for (let index = 0; index < list.length; index++) {
        const d = list[index]
        parent[level] = d.id
        if (d[key] === currentId) {
          for (let idx = 1; idx <= level; idx++) {
            pid[idx] = parent[idx]
          }
          break
        } else if (d.children) {
          loop(d.children, level + 1)
        }
      }
    }
  }
  loop(tree, 1)
  let result = []
  Object.keys(pid).sort((a, b) => a - b).forEach(k => {
    result.push(pid[k])
  })
  return result
}
/*
 * 格式化时间
 * yyyy-MM-dd hh:mm:ss
 * */
export function formatDate(date, fmt) {
  if (!date || date == null) return null;
  if (isNaN(date)) {
    return date;
  }
  let format = fmt || "yyyy-MM-dd hh:mm:ss";
  let dates = new Date(Number(date));
  let formatObj = {
    y: dates.getFullYear(),
    M: dates.getMonth() + 1,
    d: dates.getDate(),
    h: dates.getHours(),
    m: dates.getMinutes(),
    s: dates.getSeconds(),
  };
  let time_str = format.replace(/(y|M|d|h|m|s)+/g, (result, key) => {
    let value = formatObj[key];
    if (result.length > 0 && value < 10) {
      value = "0" + value;
    }
    return value || 0;
  });
  return time_str;
}
// 获取日期时间戳
export function getTime(dayNum) {
  var myDate = new Date()
  var lw = new Date(myDate - 1000 * 60 * 60 * 24 * dayNum)// 最后一个数字多少天前的意思
  var lastY = lw.getFullYear()
  var lastM = lw.getMonth() + 1
  var lastD = lw.getDate()
  var startdate = lastY + "-" + (lastM < 10 ? "0" + lastM : lastM) + "-" + (lastD < 10 ? "0" + lastD : lastD)
  var b = startdate.split(/\D/)
  var date = new Date(b[0], b[1] - 1, b[2])
  var time = date.getTime()
  return time
}
// 获取几天之前日期
export function getData(dayNum) {
  var myDate = new Date()
  var lw = new Date(myDate - 1000 * 60 * 60 * 24 * dayNum)// 最后一个数字多少天前的意思
  var lastY = lw.getFullYear()
  var lastM = lw.getMonth() + 1
  var lastD = lw.getDate()
  var startdate = lastY + "-" + (lastM < 10 ? "0" + lastM : lastM) + "-" + (lastD < 10 ? "0" + lastD : lastD)
  return startdate
}
// 日期转换时间戳
export function getNewTime(dayNum) {
  var b = dayNum.split(/\D/)
  var date = new Date(b[0], b[1] - 1, b[2])
  var time = date.getTime()
  return time
}
/*
 * 获取URL参数
 *
 * */
export function getURLParams(variable) {
  let str = window.location.href.split("?")[1];
  if (!str) return null;
  let ar = str.split("&");
  let obj = {};
  let data;
  for (var i = 0; i < ar.length; i++) {
    var pair = ar[i].split("=");
    pair[1] = decodeURIComponent(pair[1])
    if (pair[0] == variable) {
      data = pair[1]
      return pair[1]
    }
    if (pair[0]) {
      obj[pair[0]] = pair[1]
    }
  }
  return variable ? data : obj
}
/**
 * 校验答案
 * @param {*} s 源字符串
 * @param {*} questionType 题型，2单选 3多选
 * @param {*} optionCount 选项数目
 * @param {*} questionCount 题目数目
 */
function filtterChar(s, b, optionCount) {
  const ms = "ABCDEFG";
  let rs = "";
  for (let i = 0; i < s.length; i++) {
    let c = s[i];
    if (c == ',' || c == ' ' || c == '，') {
      if (!b) {
        continue;
      }
      c = ',';
    }
    else if (c < 'A' || c >= ms[optionCount]) {
      continue;
    }
    rs += c;
  }
  return rs;
}
function removeDup(s) {
  const ms = "ABCDEFG";
  let rs = "";
  for (let i = 0; i < ms.length; i++) {
    if (s.indexOf(ms[i]) >= 0) {
      rs += ms[i];
    }
  }
  return rs;
}
export function checkAnswer(s, questionType, optionCount = 4, questionCount = 1) {
  if (optionCount > 10 || questionCount < 1) {
    return null;
  }
  let pre = s;
  s = s.toUpperCase();
  s = filtterChar(s, questionType == 3 && questionCount > 1, optionCount);
  if (questionType == 2) {//单选
    console.log(s.length + " " + questionCount);
    if (s.length > questionCount) {
      s = s.substring(s.length - questionCount, s.length);
    }
  }
  else if (questionType == 3) {//多选
    //允许逗号
    let ss = s.split(",");
    let len = questionCount;
    if (len > ss.length) {
      len = ss.length;
    }
    let rs = "";
    for (let i = 0; i < len; i++) {
      rs += removeDup(ss[i]);
      if (i < len - 1) {
        rs += ',';
      }
    }
    s = rs;
  }
  else {
    return null;
  }
  return s;
}