[JavaScript知识库]Vue不请求接口，纯前端实现下载excel模板，zip压缩包

上传文件时，想要先下载文件模板，因为很多地方用到，后端觉得麻烦，所以前端来简单实现

1.安装插件

npm install --save file-saver xlsx
npm install --save script-loader 

// 无需在main.js再引入

2.如果安装之后报错，就再下载这个依赖(我按着别的博主的文章执行的，他们没有报错，但我的报错了，所以根据项目需求来安装依赖，不报错就跳过这步)：

npm install --save file-saver xlsx

3.新建一个文件夹，我是放在了src/utils下，js代码直接复制就行

//excel.js

import { export_json_to_excel } from './Export2Excel'
export function downloadFile (url) {
  try {
    var elemIF = document.createElement('iframe')
    elemIF.src = url
    elemIF.style.display = 'none'
    document.body.appendChild(elemIF)
  } catch (e) {
    console.error(e)
  }
}
// 导出excel 表格  tHeader 表头  filterVal 过滤的字段 list 数据集合  具体实现 见 md 文件
export function exportExcels (tabHeader, tabFilterVal, tabList, fileName = Math.random() * 100) {
  // require.ensure([], () => {
  // eslint-disable-next-line camelcase
  // const { export_json_to_excel } = require('../excel/Export2Excel')
  // const tHeader = tabHeader
  // const filterVal = tabFilterVal
  // const list = tabList
  // const data = list.map(v => filterVal.map(j => v[j]))
  // export_json_to_excel(tHeader, data, fileName)
  // })

  const data = formatJson(tabFilterVal, tabList)
  export_json_to_excel({
    header: tabHeader,
    data,
    filename: fileName
  })
  function formatJson (filterVal, tableData) {
    return tableData.map(v => {
      return filterVal.map(j => {
        return v[j]
      })
    })
  }
}

//Export2Excel.js

/* eslint-disable */
require('script-loader!file-saver');
import XLSX from 'js-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 ({
                                        header,
                                        data,
                                        filename,
                                        autoWidth = true,
                                        bookType = 'xlsx'
                                      } = {}) {
  /* original data */
  filename = filename || 'excel-list'
  data = [...data]
  data.unshift(header);
  var ws_name = "SheetJS";
  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data);

  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 这个应该是下载zip包的（我项目里暂时没用到）

/* eslint-disable */
require('script-loader!file-saver');
import JSZip from 'gzip-size'
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')
  })
}

表格字段，根据你的需求自行更改

//下载excel模板

//商品模板
export const goodsTemplate = [
  {
    goodsName:'苹果',
    spec:'大',
    unit:'箱',
    classOne:'1',
    classTwo:'2',
    classThree:'3',
  },
  {
    name:'梨',
    spec:'大',
    unit:'箱',
    classOne:'1',
    classTwo:'2',
    classThree:'3',
  },
  {
    name:'草莓',
    spec:'小',
    unit:'箱',
    classOne:'1',
    classTwo:'2',
    classThree:'3',
  }
]

4.页面使用

import {exportExcels} from '@/utils/excelTemplate/excel'
import { goodsTemplate } from '@/utils/excelTemplate/templateData' //excel商品模板

 //下载模板事件
    downTemplateClick(){
      let tabHeader = ['商品名称', '规格型号', '单位', '一级分类', '二级分类', '三级分类']
      let tabFilterVal = ['goodsName', 'spec', 'unit', 'classOne', 'classTwo', 'classThree']
      exportExcels(tabHeader, tabFilterVal, goodsTemplate, '导入商品模板')
    },

完结撒花~

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