common.js

import axios from 'axios'
import {
  MessageBox
} from 'element-ui'
export default {
  /**
   * 数组元素查询——针对数组元素中object某一项值
   * @param val
   * @param store
   * @param findKey
   */
  arrayFind: function(val, store, findKey) {
    let res = ''
    if(!store) {
      return val
    }
    if(!findKey) {
      findKey = 'value'
    }
    try {
      store.forEach(function(item, index) {
        if(item[findKey] == val) {
          let curItem = JSON.parse(JSON.stringify(item))
          curItem.findIndex = index
          res = curItem
          throw new Error('end forEach')
        }
      })
    } catch(e) {
      if(e.message = 'end forEach') {
        console.log(e.message)
      }
    }
    return res
  },
  /**
   * 枚举渲染
   * @param ename
   * @param store
   * @returns {*}
   */
  globalRender: function(ename, store, checkFlag) {
    let val = ''
    if (!checkFlag) {
      val = ename
    }
    if (!store) {
      return val
    }
    if (store.length != 0) {
      for (let i = 0; i < store.length; i++) {
        if (ename == store[i].key) {
          return store[i].value || store[i].key
        } else if (i == store.length - 1) {
          return val;
        }
      }
    } else {
      return val;
    }
  },
  /**
   * 时间戳转字符串
   * @param num
   * @returns {*}
   */
  detailTime: function(num) {
    if (num == null) {
      return '';
    } else {
      num = Number(num);
      let d = new Date(num);
      let year = d.getFullYear();
      let month = d.getMonth() + 1;
      let date = d.getDate();
      let hour = d.getHours();
      let minute = d.getMinutes();
      let second = d.getSeconds();
      month < 10 ? month = '0' + month : month;
      date < 10 ? date = '0' + date : date;
      hour < 10 ? hour = '0' + hour : hour;
      minute < 10 ? minute = '0' + minute : minute;
      second < 10 ? second = '0' + second : second;
      return year + "-" + month + "-" + date + " " + hour + ":" + minute + ":" + second;
    }
  },
  /**
   * 文件后缀时间戳
   * @param {*} num 
   * @returns 
   */
  fileTimeStamp: function(num) {
    if (num == null) {
      return '';
    } else {
      num = Number(num);
      let d = new Date(num);
      let year = d.getFullYear();
      let month = d.getMonth() + 1;
      let date = d.getDate();
      let hour = d.getHours();
      let minute = d.getMinutes();
      let second = d.getSeconds();
      month < 10 ? month = '0' + month : month;
      date < 10 ? date = '0' + date : date;
      hour < 10 ? hour = '0' + hour : hour;
      minute < 10 ? minute = '0' + minute : minute;
      second < 10 ? second = '0' + second : second;
      return year + "-" + month + "-" + date + "-" + hour + "" + minute + "" + second;
    }
  },
  /**
   * 浮点数加法，用于解决精度丢失问题
   * @param {*} num1 
   * @param {*} num2 
   * @returns 
   */
  addStr: function(num1, num2) {
    var r1, r2, m;
    try {
      r1 = num1.toString().split('.')[1].length;
    } catch (e) {
      r1 = 0;
    }
    try {
      r2 = num2.toString().split(".")[1].length;
    } catch (e) {
      r2 = 0;
    }
    m = Math.pow(10, Math.max(r1, r2));
    return Math.round(num1 * m + num2 * m) / m;
  },
  /**
   * 浮点数减法，用于解决精度丢失问题
   * @param {*} arg1 
   * @param {*} arg2 
   * @returns 
   */
  subStr: function(arg1, arg2) {
    var r1, r2, m, n;
    try {
      r1 = arg1.toString().split(".")[1].length
    } catch (e) {
      r1 = 0
    }
    try {
      r2 = arg2.toString().split(".")[1].length
    } catch (e) {
      r2 = 0
    }
    m = Math.pow(10, Math.max(r1, r2));
    n = (r1 >= r2) ? r1 : r2;
    return ((arg1 * m - arg2 * m) / m).toFixed(n);
  },
  /**
   * 浮点数乘法，用于解决精度丢失问题
   * @param {*} arg1 
   * @param {*} arg2 
   * @param {*} n 保留位数
   * @returns 
   */
  mulStr: function(arg1, arg2, n) {
    var m = 0,
      s1 = arg1.toString(),
      s2 = arg2.toString();
    try {
      m += s1.split('.')[1].length
    } catch (e) {
      //TODO handle the exception
    }
    try {
      m += s2.split('.')[1].length
    } catch (e) {}
    var val = Number(s1.replace('.', '')) * Number(s2.replace('.', '')) / Math.pow(10, m)
    if(n) {
      val = val.toFixed(n)
    }
    return val
  },
  /**
   * 浮点数除法，用于解决精度丢失问题
   * @param {*} arg1 
   * @param {*} arg2 
   * @param {*} n 保留位数
   * @returns 
   */
  divStr: function(arg1, arg2, n) {
    var t1 = 0,
      t2 = 0,
      r1, r2;
    try {
      t1 = arg1.toString().split('.')[1].length
    } catch (e) {
      //TODO handle the exception
    }
    try {
      t2 = arg2.toString().split('.')[1].length
    } catch (e) {
      //TODO handle the exception
    }
    r1 = Number(arg1.toString().replace('.', ''));
    r2 = Number(arg2.toString().replace('.', ''));
    var val = (r1 / r2) * Math.pow(10, t2 - t1)
    if(n) {
      val = val.toFixed(n)
    }
    return val
  },
  /**
   * 隐藏身份证号
   * @param {*} idCard 
   * @returns 
   */
  hideIdNumber: function(idCard) {
    if (idCard.length === 18) {
      return idCard.substr(0, 6) + '********' + idCard.substr(-4, 4)
    } else if (idCard.length === 15) {
      return idCard.substr(0, 6) + '******' + idCard.substr(-3, 3)
    } else {
      return idCard
    }
  },
  /**
   * 隐藏手机号
   * @param {*} phone 
   * @returns 
   */
  hidePhone: function(phone) {
    if(phone.length == 11) {
      return phone.substr(0,3) + '*****' + phone.substr(-3,3)
    } else {
      return phone
    }
  },
  /**
   * 导出excel
   * @param content
   * @param fileName
   * @param fileParam
   * @param blobType
   * @param fileType
   * */
  exportExcel: function({
    content,
    fileName,
    fileParam,
    blobType,
    fileType
  }) {
    let __this = this
    if (!content) return
    if (!blobType) blobType = 'application/vnd.ms-excel'
    if (!fileName) fileName = '导出文件'
    if (!fileType) fileType = 'xls'
    if (!fileParam) fileParam = ''
    let fileNames = fileName + fileParam
    __this.createBlob(content, blobType, fileNames, fileType)
  },
  /**
   * 下载本地文件
   * @param fileJson
   * */
  downloadLocalFile: function(fileSrc, blobType, fileName, fileType) {
    let __this = this
    let getUrl = fileSrc
    if (getUrl.indexOf('?') < 0) getUrl = fileSrc + '?' + new Date().getTime()
    console.log(getUrl)
    axios.create().get(getUrl, {
      responseType: 'blob'
    }).then(response => {
      if (window.navigator.msSaveBlob) { //ie浏览器不支持通过a标签下载文件
        try {
          window.navigator.msSaveBlob(response.data, (fileName + '-' + __this.fileTimeStamp(new Date().getTime()) +
            '.' + fileType))
        } catch (e) {
          MessageBox.confirm('该浏览器内核不支持下载此文件，推荐使用谷歌浏览器访问本平台', '提示', {
            confirmButtonText: "确定",
            showClose: false,
            showCancelButton: false,
            callback: function(action) {
              // window.location.reload()
            }
          })
        }
      } else {
        __this.createBlob(response.data, blobType, fileName, fileType)
      }
    })
  },
  /**
   * 创建blob，用于下载文件
   * @param {*} content 
   * @param {*} blobType 
   * @param {*} fileName 
   * @param {*} fileType 
   */
  createBlob: function(content, blobType, fileName, fileType) {
    let __this = this
    let blob = new Blob([content], {
      type: blobType
    })
    let filename = fileName + '-' + __this.fileTimeStamp(new Date().getTime()) + '.' + fileType
    if ('download' in document.createElement('a')) {
      let eleLink = document.createElement('a')
      eleLink.download = filename
      eleLink.style.display = 'none'
      eleLink.href = URL.createObjectURL(blob)
      document.body.appendChild(eleLink)
      eleLink.click()
      URL.revokeObjectURL(eleLink.href)
      document.body.removeChild(eleLink)
    } else {
      navigator.msSaveBlob(blob, filename)
    }
  },
  /**
   * 通过url下载文件
   * @param {*} url 
   */
  downloadFile(url) {
    let urlParam = '';
    if (url.indexOf('?') >= 0) {
      urlParam = url.split('?')[1]
      url = url.split('?')[0]
    }
    let splitArr = url.split('/')
    let fileName = splitArr[splitArr.length - 1].slice(0, -4)
    let fileType = splitArr[splitArr.length - 1].slice(-4)
    if (fileType.indexOf('.') < 0) {
      fileName = fileName.slice(0, -1)
    } else {
      fileType = fileType.replace(/./, '')
    }
    let lastType = fileType
    fileType = fileType.toLowerCase()
    console.log(fileName, fileType)
    let blobType = ''
    switch (fileType) {
      case 'xls':
      case 'xlsx':
        blobType = 'application/vnd.ms-excel'
        break;
      // case 'xlsx':
      //   blobType = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.'
      //   break;
      case 'doc':
      case 'docx':
        blobType = 'application/msword'
        break;
      case 'ppt':
      case 'pptx':
        blobType = 'application/vnd.ms-powerpoint'
        break;
      case 'txt':
        blobType = 'text/plain'
        break;
      case 'jpg':
      case 'jpeg':
        blobType = 'image/jpeg'
        break;
      case 'png':
        blobType = 'image/png'
        break;
      case 'pdf':
        blobType = 'application/pdf'
        break;
      case 'zip':
        blobType = 'application/zip'
        break;
    }
    let imgType = '.jpg,.jpeg,.png'
    if (imgType.indexOf(fileType) >= 0) {
      let image = new Image()
      image.setAttribute("crossOrigin", "anonymous");
      image.onload = function() {
        let canvas = document.createElement("canvas");
        canvas.width = image.width;
        canvas.height = image.height;
        let context = canvas.getContext("2d");
        context.drawImage(image, 0, 0, image.width, image.height);
        let url = canvas.toDataURL(blobType, 1.0); //得到图片的base64编码数据
        let a = document.createElement("a"); // 生成一个a元素
        let event = new MouseEvent("click"); // 创建一个单击事件
        // let filename = fileName + '-' + fileTimeStamp(new Date().getTime()) + '.' + fileType
        let filename = fileName + '.' + lastType
        a.download = filename; // 设置图片名称
        a.href = url; // 将生成的URL设置为a.href属性
        a.dispatchEvent(event); // 触发a的单击事件
      };
      image.src = url;
    } else {
      let fileSrc = splitArr.slice(0, -1).join('/') + '/' + encodeURIComponent(fileName) + '.' + fileType
      if (fileType == 'txt') {
        console.log(fileSrc, url)
        downloadLocalFile(fileSrc, blobType, fileName, fileType)
      } else {
        let form = document.createElement('form')
        form.method = 'get'
        form.action = urlParam ? (fileSrc + '?' + urlParam) : fileSrc
        document.body.append(form)
        form.submit()
        form.remove()
      }
    }
  }
}