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JavaScript导入导出excel

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Excel导入

先下包(xlsx)

npm i xlsx

把数组里面中文的键修改成英文的键:

原因：因为中文的键后台不认识，只能修改成英文的键

实现方式1

success({ hearder, results }) {
const userRelations = {
        入职日期: "timeOfEntry",
        手机号: "mobile",
        姓名: "username",
        转正日期: "correctionTime",
        工号: "workNumber",
      };
      var arr=[]
      results.forEach(item=>{
        var userInfo={}
        Object.keys(item).forEach(key=>{
          // 现在 key 是中文
          userInfo[userRelations[key]]=item[key] // 将原来中文对应的值 赋值给原来英文对应的值
        }) // item 是原来数据结构 中文
        arr.push(userInfo)
      })
}

实现方式2

var newArr = results.map((item) => {
        var userInfo = {};
        Object.keys(item).forEach((key) => {
          userInfo[userRelations[key]] = item[key]; // 将原来中文对应的值 赋值给原来英文对应的值
        });
        return userInfo;
      });

转化Excel日期格式：

var newArr = results.map((item) => {
        var userInfo = {};
        Object.keys(item).forEach((key) => {
          if (
            userRelations[key] === "timeOfEntry" ||
            userRelations[key] === "correctionTime"
          ) {
            //因为后端接口 限制了不能是字符串 要求转换时间类型，不然会变成 NAN
            userInfo[userRelations[key]] = new Date(
              this.formatDate(item[key], "/")// 只有这样才能存入数据库
            );
          } else {
            userInfo[userRelations[key]] = item[key]; // 将原来中文对应的值 赋值给原来英文对应的值
          }
        });
        return userInfo;
      });
formatDate(numb, format) { // 代码是 copy 的，逻辑不用明白
      const time = new Date((numb - 1) * 24 * 3600000 + 1)
      time.setYear(time.getFullYear() - 70)
      const year = time.getFullYear() + ''
      const month = time.getMonth() + 1 + ''
      const date = time.getDate() - 1 + ''
      if (format && format.length === 1) {
        return year + format + month + format + date
      }
      return year + (month < 10 ? '0' + month : month) + (date < 10 ? '0' + date : date)
    }

Excel导出

先下包(xlsx file-saver、script-loader(负责懒加载))

npm install script-loader -S -D

npm install xlsx file-saver -S

然后把两个文件给引到src目录下 Export2Excel.js Export2Zip.js

 exportData() {
      const headers = {
        姓名: "username",
        手机号: "mobile",
        入职日期: "timeOfEntry",
        聘用形式: "formOfEmployment",
        转正日期: "correctionTime",
        工号: "workNumber",
        部门: "departmentName",
      };
      import("@/vendor/Export2Excel").then(async (excel) => {
        const { rows } = await getEmployeeList({
          page: 1,
          size: this.page.total,
        });
        const data = this.formatJson(headers, rows); // 返回的data就是要导出的结构
        excel.export_json_to_excel({
          header: Object.keys(headers),
          data,
        });
      });
    },
     formatJson(headers, rows) {
      // 首先遍历数组
      return rows.map((item) => {
        // item是一个对象 {mobile：13213,username：'张三'}
        return Object.keys(headers).map((key) => {
          if (
            headers[key] === "timeOfEntry" ||
            headers[key] === "correctionTime"
          ) {
            // 格式化日期
            return formatDate(item[headers[key]]);
          } else if (headers[key] === "formOfEmployment") {
            const obj = EmployeeEnum.hireType.find(
              (obj) => obj.id === item[headers[key]]
            );
            return obj ? obj.value : "未知";
          }
          return item[headers[key]];
        });
      });
    },

Excel表格合并

 const multiHeader = [["姓名", "主要信息", "", "", "", "", "部门"]];
        const merges = ["A1:A2", "B1:F1", "G1:G2"]; // 要合并Excel的表格，从多少到多少
        excel.export_json_to_excel({
          header: Object.keys(headers),
          data,
          filename: "员工资料表",
          multiHeader, // 复杂表头
          merges, // 合并选项
        });

需要引入的代码文件：（代码无需理解，copy就行）

Export2Excel.js代码：

/* eslint-disable */
import { saveAs } from 'file-saver'
import XLSX from 'xlsx'
 
function generateArray(table) {
  var out = [];
  var rows = table.querySelectorAll('tr');
  var ranges = [];
  for (var R = 0; R < rows.length; ++R) {
    var outRow = [];
    var row = rows[R];
    var columns = row.querySelectorAll('td');
    for (var C = 0; C < columns.length; ++C) {
      var cell = columns[C];
      var colspan = cell.getAttribute('colspan');
      var rowspan = cell.getAttribute('rowspan');
      var cellValue = cell.innerText;
      if (cellValue !== "" && cellValue == +cellValue) cellValue = +cellValue;
 
      //Skip ranges
      ranges.forEach(function (range) {
        if (R >= range.s.r && R <= range.e.r && outRow.length >= range.s.c && outRow.length <= range.e.c) {
          for (var i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null);
        }
      });
 
      //Handle Row Span
      if (rowspan || colspan) {
        rowspan = rowspan || 1;
        colspan = colspan || 1;
        ranges.push({
          s: {
            r: R,
            c: outRow.length
          },
          e: {
            r: R + rowspan - 1,
            c: outRow.length + colspan - 1
          }
        });
      };
 
      //Handle Value
      outRow.push(cellValue !== "" ? cellValue : null);
 
      //Handle Colspan
      if (colspan)
        for (var k = 0; k < colspan - 1; ++k) outRow.push(null);
    }
    out.push(outRow);
  }
  return [out, ranges];
};
 
function datenum(v, date1904) {
  if (date1904) v += 1462;
  var epoch = Date.parse(v);
  return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
}
 
function sheet_from_array_of_arrays(data, opts) {
  var ws = {};
  var range = {
    s: {
      c: 10000000,
      r: 10000000
    },
    e: {
      c: 0,
      r: 0
    }
  };
  for (var R = 0; R != data.length; ++R) {
    for (var C = 0; C != data[R].length; ++C) {
      if (range.s.r > R) range.s.r = R;
      if (range.s.c > C) range.s.c = C;
      if (range.e.r < R) range.e.r = R;
      if (range.e.c < C) range.e.c = C;
      var cell = {
        v: data[R][C]
      };
      if (cell.v == null) continue;
      var cell_ref = XLSX.utils.encode_cell({
        c: C,
        r: R
      });
 
      if (typeof cell.v === 'number') cell.t = 'n';
      else if (typeof cell.v === 'boolean') cell.t = 'b';
      else if (cell.v instanceof Date) {
        cell.t = 'n';
        cell.z = XLSX.SSF._table[14];
        cell.v = datenum(cell.v);
      } else cell.t = 's';
 
      ws[cell_ref] = cell;
    }
  }
  if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
  return ws;
}
 
function Workbook() {
  if (!(this instanceof Workbook)) return new Workbook();
  this.SheetNames = [];
  this.Sheets = {};
}
 
function s2ab(s) {
  var buf = new ArrayBuffer(s.length);
  var view = new Uint8Array(buf);
  for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
  return buf;
}
 
export function export_table_to_excel(id) {
  var theTable = document.getElementById(id);
  var oo = generateArray(theTable);
  var ranges = oo[1];
 
  /* original data */
  var data = oo[0];
  var ws_name = "SheetJS";
 
  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data);
 
  /* add ranges to worksheet */
  // ws['!cols'] = ['apple', 'banan'];
  ws['!merges'] = ranges;
 
  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;
 
  var wbout = XLSX.write(wb, {
    bookType: 'xlsx',
    bookSST: false,
    type: 'binary'
  });
 
  saveAs(new Blob([s2ab(wbout)], {
    type: "application/octet-stream"
  }), "test.xlsx")
}
 
export function export_json_to_excel({
  multiHeader = [],
  header,
  data,
  filename,
  merges = [],
  autoWidth = true,
  bookType = 'xlsx'
} = {}) {
  /* original data */
  filename = filename || 'excel-list'
  data = [...data]
  data.unshift(header);
 
  for (let i = multiHeader.length - 1; i > -1; i--) {
    data.unshift(multiHeader[i])
  }
 
  var ws_name = "SheetJS";
  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data);
 
  if (merges.length > 0) {
    if (!ws['!merges']) ws['!merges'] = [];
    merges.forEach(item => {
      ws['!merges'].push(XLSX.utils.decode_range(item))
    })
  }
 
  if (autoWidth) {
    /*设置worksheet每列的最大宽度*/
    const colWidth = data.map(row => row.map(val => {
      /*先判断是否为null/undefined*/
      if (val == null) {
        return {
          'wch': 10
        };
      }
      /*再判断是否为中文*/
      else if (val.toString().charCodeAt(0) > 255) {
        return {
          'wch': val.toString().length * 2
        };
      } else {
        return {
          'wch': val.toString().length
        };
      }
    }))
    /*以第一行为初始值*/
    let result = colWidth[0];
    for (let i = 1; i < colWidth.length; i++) {
      for (let j = 0; j < colWidth[i].length; j++) {
        if (result[j]['wch'] < colWidth[i][j]['wch']) {
          result[j]['wch'] = colWidth[i][j]['wch'];
        }
      }
    }
    ws['!cols'] = result;
  }
 
  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;
 
  var wbout = XLSX.write(wb, {
    bookType: bookType,
    bookSST: false,
    type: 'binary'
  });
  saveAs(new Blob([s2ab(wbout)], {
    type: "application/octet-stream"
  }), `${filename}.${bookType}`);
}

​Export2Zip.js代码：

/* eslint-disable */
import { saveAs } from 'file-saver'
import JSZip from 'jszip'
 
export function export_txt_to_zip(th, jsonData, txtName, zipName) {
  const zip = new JSZip()
  const txt_name = txtName || 'file'
  const zip_name = zipName || 'file'
  const data = jsonData
  let txtData = `${th}\r\n`
  data.forEach((row) => {
    let tempStr = ''
    tempStr = row.toString()
    txtData += `${tempStr}\r\n`
  })
  zip.file(`${txt_name}.txt`, txtData)
  zip.generateAsync({
    type: "blob"
  }).then((blob) => {
    saveAs(blob, `${zip_name}.zip`)
  }, (err) => {
    alert('导出失败')
  })
}

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