FE_exam/src/libs/util.js

import { _local } from "./util.db";
import { Message } from "element-ui";
import store from "@/store";
import Setting from '@/setting'
import axios from 'axios'
import api from '@/api'

// 文件后缀集合
const exts = {
  video: 'mp4,3gp,mov,m4v,avi,dat,mkv,flv,vob,rmvb,rm,qlv',
  audio: 'mp3,aac,ape,flac,wav,wma,amr,mid',
  img: 'jpg,jpeg,png,gif,svg,psd',
  doc: 'doc,docx,txt,xls,xlsx,csv,xml,ppt,pptx'
}
const util = {
  local: _local,
  // 筛选出有权限的站点
  getSite (list) {
    const result = []
    const auth = store.state.auth.btns
    list.map(e => {
      auth.find(n => n.includes(e.siteName)) && result.push(e)
    })
    return result
  },
  //返回格式化时间，传参例如："yyyy-MM-dd hh:mm:ss"
  formatDate (fmt, date) {
    var date = date ? date : new Date();
    var o = {
      "M+": date.getMonth() + 1,                 //月份
      "d+": date.getDate(),                    //日
      "h+": date.getHours(),                   //小时
      "m+": date.getMinutes(),                 //分
      "s+": date.getSeconds(),                 //秒
      "q+": Math.floor((date.getMonth() + 3) / 3), //季度
      "S": date.getMilliseconds()             //毫秒
    };
    if (/(y+)/.test(fmt)) {
      fmt = fmt.replace(RegExp.$1, (date.getFullYear() + "").substr(4 - RegExp.$1.length));
    }
    for (var k in o) {
      if (new RegExp("(" + k + ")").test(fmt)) {
        fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
      }
    }
    return fmt;
  },
  // 传入文件后缀判断是否是视频
  isVideo (ext) {
    if (exts.video.includes(ext)) return true;
    return false;
  },
  // 传入文件后缀判断是否是音频
  isAudio (ext) {
    if (exts.audio.includes(ext)) return true;
    return false;
  },
  // 传入文件后缀判断是否是图片
  isImg (ext) {
    if (exts.img.includes(ext.toLowerCase())) return true;
    return false;
  },
  // 传入文件后缀判断是否是pdf以外的文档
  isDoc (ext) {
    if (exts.doc.includes(ext)) return true;
    return false;
  },
  // 传入文件名和路径，下载图片视频，支持跨域，a标签加download不支持跨域
  downloadFile (fileName, url) {
    var x = new XMLHttpRequest();
    x.open("GET", url, true);
    x.responseType = "blob";
    x.onload = function (e) {
      var url = window.URL.createObjectURL(x.response);
      var a = document.createElement("a");
      a.href = url;
      a.download = fileName;
      a.click();
    };
    x.send();
  },
  // 传入文件名和数据，下载文件
  downloadFileDirect (fileName, data) {
    if ("download" in document.createElement("a")) { // 非IE下载
      const elink = document.createElement("a");
      elink.download = fileName;
      elink.style.display = "none";
      elink.href = URL.createObjectURL(data);
      document.body.appendChild(elink);
      elink.click();
      URL.revokeObjectURL(elink.href); // 释放URL 对象
      document.body.removeChild(elink);
    } else { // IE10+下载
      navigator.msSaveBlob(data, fileName);
    }
  },
  // 成功提示
  successMsg (message, duration = 3000) {
    Message.closeAll();
    return Message.success({ message, showClose: true, offset: (document.documentElement.clientHeight - 40) / 2, duration });
  },
  // 警告提示
  warningMsg (message, duration = 3000) {
    Message.closeAll();
    return Message.warning({ message, showClose: true, offset: (document.documentElement.clientHeight - 40) / 2, duration });
  },
  // 错误提示
  errorMsg (message, duration = 3000) {
    Message.closeAll();
    return Message.error({ message, showClose: true, offset: (document.documentElement.clientHeight - 40) / 2, duration });
  },
  // 阿拉伯数字转化为中文数字
  arabicToChinese (num) {
    const arr1 = ['零', '一', '二', '三', '四', '五', '六', '七', '八', '九'];
    const arr2 = ['', '十', '百', '千', '万', '亿', '点', ''];
    const a = `${num}`.replace(/(^0*)/g, '').split('.');
    let k = 0;
    let re = '';
    for (let i = a[0].length - 1; i >= 0; i--) {
      switch (k) {
        case 0:
          re = arr2[7] + re;
          break;
        case 4:
          if (!new RegExp(`0{4}//d{${a[0].length - i - 1}}$`).test(a[0])) re = arr2[4] + re;
          break;
        case 8:
          re = arr2[5] + re;
          arr2[7] = arr2[5];
          k = 0;
          break;
        default:
      }
      if (k % 4 == 2 && a[0].charAt(i + 2) != 0 && a[0].charAt(i + 1) == 0) re = arr1[0] + re;
      if (a[0].charAt(i) != 0) re = arr1[a[0].charAt(i)] + arr2[k % 4] + re;
      k++;
    }
    return num > 9 && num < 20 ? re.slice(1) : re;
  },
  // 阿拉伯数字转化为英文字母
  numToLetter (num) {
    let result = ''
    if (num > 26) {
      result += numberToLetter((num / 26) >> 0 - 1)
    }
    result += String.fromCharCode(65 + (num % 26))
    return result
  },
  // 去掉html里的标签及空格
  delTag (html) {
    const el = document.createElement('div')
    el.innerHTML = html
    return el.innerText
  },
  // 循环去掉列表里html里的标签及空格
  removeTag (list, prop = 'stem') {
    list.map(e => {
      const el = document.createElement('div')
      el.innerHTML = e[prop]
      e[prop] = el.innerText
    })
    return list
  },
  // 传入文件名获取文件后缀
  getFileExt (fileName) {
    return fileName.substring(fileName.lastIndexOf(".") + 1);
  },
  // 获取当前时间
  getNow () {
    return new Promise(async (resolve, reject) => {
      const { data } = await axios.get(Setting.apiBaseURL + api.getCurrentTime, {
        headers: {
          token: _local.get(Setting.tokenKey)
        }
      })
      resolve(new Date(data.currentTime))
    })
  },
  getUuid () {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
      var r = Math.random() * 16 | 0,
        v = c == 'x' ? r : (r & 0x3 | 0x8);
      return v.toString(16);
    })
  }
};

export default util;