vue前端-使用工具类下载excle模板

excel工具类

/* eslint-disable */

import XLSX from 'xlsx';
/**
 * @description: 
 * @param {Object} json 服务端发过来的数据
 * @param {String} name 导出Excel文件名字
 * @return: 
 */
function exportExcel (json, name, wscols) {
  /* convert state to workbook */
  var data = new Array();
  var keyArray = new Array();

  for (const key1 in json) {
    if (json.hasOwnProperty(key1)) {
      const element = json[key1];
      var rowDataArray = new Array();
      for (const key2 in element) {
        if (element.hasOwnProperty(key2)) {
          const element2 = element[key2];
          rowDataArray.push(element2);
          if (keyArray.length < getLength(element)) {
            keyArray.push(key2);
          }
        }
      }
      data.push(rowDataArray);
    }
  }

  data.splice(0, 0, keyArray);
  const ws = XLSX.utils.aoa_to_sheet(data);
  if (wscols) {
    ws['!cols'] = wscols;
  }
  const wb = XLSX.utils.book_new();
  XLSX.utils.book_append_sheet(wb, ws, "SheetJS");
  /* generate file and send to client */
  XLSX.writeFile(wb, name + ".xlsx");
}

/**
 * @description: 导入excel文件并返回数据
 * @param {function} 回调函数参数data,dataRef,一个是数据，一个是exce表单的索引 
 * @return: 
 */
function importExcel (callback) {
  var inputObj = document.createElement('input')
  inputObj.setAttribute('id', 'file');
  inputObj.setAttribute('type', 'file');
  inputObj.setAttribute('name', 'file');
  inputObj.setAttribute("style", 'visibility:hidden');
  inputObj.setAttribute("accept", ".xlsx,.xls,.csv")
  inputObj.addEventListener('change', (evt) => {
    const files = evt.target.files;
    if (files && files[0]) _file(files[0], (data, dataRef) => {
      callback(data, dataRef)
    });
  })
  document.body.appendChild(inputObj);
  inputObj.value;
  inputObj.click();

}

/**
 * @description: 处理文件
 * @param {Object} file 文件对象
 * @param {function} callback 回调函数 
 * @return: 
 */
function _file (file, callback) {
  const make_cols = refstr => Array(XLSX.utils.decode_range(refstr).e.c + 1).fill(0).map((x, i) => ({
    name: XLSX.utils.encode_col(i),
    key: i
  }));

  /* Boilerplate to set up FileReader */
  const reader = new FileReader();
  reader.onload = (e) => {
    /* Parse data */
    const bstr = e.target.result;
    const wb = XLSX.read(bstr, {
      type: 'binary'
    });
    /* Get first worksheet */
    const wsname = wb.SheetNames[0];
    const ws = wb.Sheets[wsname];
    /* Convert array of arrays */
    const data = XLSX.utils.sheet_to_json(ws, {
      header: 1
    });
    /* Update state */
    callback(data, make_cols(ws['!ref']))

  };
  reader.readAsBinaryString(file);
}

/**
 * @description: 获取map的长度
 * @param {Object} obj map对象 
 * @return: map的长度
 */
function getLength (obj) {

  var count = 0;
  for (var i in obj) {

    if (obj.hasOwnProperty(i)) {
      count++;

    }
  }

  return count;
}
export default {
  exportExcel,
  importExcel
}