app-base-web/.src/library/util-xlsx/index.js

web development common base package.

/**
 * @module xlsx
 */
const XLSX = require('xlsx');

const makeCols = function (refstr) {
  return Array(XLSX.utils.decode_range(refstr).e.c + 1).fill(0).map((x, i) => ({ name: XLSX.utils.encode_col(i), key: i }))
}

module.exports = {
  /**
   * 导出
   * @param data {object} 导出数据
   * @param filename {string} 导出文件名
   */
  write: function (data, filename) {
    /* convert state to workbook */
    const ws = XLSX.utils.aoa_to_sheet(data);
    const wb = XLSX.utils.book_new();
    XLSX.utils.book_append_sheet(wb, ws, "Sheet01");
    /* generate file and send to client */
    XLSX.writeFile(wb, filename);
  },
  /**
   * 读取数据
   * @param file {file}
   * @return {Promise<any>}
   */
  read: function (file) {
    return new Promise(function (resolve, reject) {
      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 */
        let data = XLSX.utils.sheet_to_json(ws, { header: 1 });
        let cols = makeCols(ws['!ref']);
        resolve({ data, cols })
      };
      reader.readAsBinaryString(file);
    })
  },
}