vue项目后端返回数据导出excel表格

1.安装

npm i xlsx
npm install xlsx-style --save

安装npm install xlsx-style --save的时候会报错，处理下就好
需要修改源码：
1、在\node_modules\xlsx-style\dist\cpexcel.js 807行把 var cpt = require(‘./cpt’ + ‘able’); 改成 var cpt = cptable;
2、在\node_modules\xlsx-style\ods.js 10行和12行把路径改为 require(‘./xlsx’)

2.使用

utils/Blob.js 跟网上其他地方一样无区别，主要是exportExcel，我做了一些修改，可以内容自动换行
utils/exportExcel.js

/* eslint-disable */
require('script-loader!file-saver');
require('@/utils/Blob');
require('script-loader!xlsx/dist/xlsx.core.min');
import XLSX from 'xlsx';
import XLSXS from "xlsx-style"
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'
  );
}
//导出表格
export function export_json_to_excel({
  header,
  data,
  filename = 'excel-list',
  autoWidth = true,
  merges = [],
  multiHeader = [],
} = {}) {
  /* original data */
  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);
  for (let key in ws) {
    if (ws[key] instanceof Object) {
      ws[key].s = {
        alignment: {
          wrapText: true, //自动换行
        },
      }
    }
  }
  // 合并单元格
  if (merges.length > 0) {
    if (!ws['!merges']) ws['!merges'] = [];
    merges.forEach(item => {
      ws['!merges'].push(XLSX.utils.decode_range(item))
    })
  }
  if (autoWidth) {
    let colWidths = [];
    // 计算每一列的所有单元格宽度
    // 先遍历行
    data.forEach((row) => {
      // 列序号
      let index = 0
      // 遍历列
      for (const key in row) {
        if (colWidths[index] == null) colWidths[index] = []
        switch (typeof row[key]) {
          case 'string':
          case 'number':
          case 'boolean':
            // 判断数据是否有\n，且自动换行
            var reg = RegExp(/\n/);
            if(reg.test(row[key])){
              let result=row[key].split('\n')
              let arr=result.map((v)=>{
                return v.length
              })
              let maxIndex=Math.max(...arr);
              let indexs=result.findIndex(ele=>ele.length==maxIndex)
              // 判断是否为中文
              if(result[indexs].toString().charCodeAt(0) > 255){
                colWidths[index].push(result[indexs].toString().length*2)
              }else{
                colWidths[index].push(result[indexs].length)
              }
            }else{
              colWidths[index].push(getCellWidth(row[key]))
            }    
            break
          case 'object':
          case 'function':
            colWidths[index].push(0)
            break
        }
        index++
      }
    })
    ws['!cols'] = [];
    colWidths.forEach((widths, index) => {
      // 计算列头的宽度
      widths.push(getCellWidth(header[index]))
      // 设置最大值为列宽
      ws['!cols'].push({
        wch: Math.max(...widths).toFixed(0)
      })
    })
  }

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;

  var wbout = XLSXS.write(wb, {
    bookType: 'xlsx',
    bookSST: false,
    type: 'binary'
  });
  saveAs(
    new Blob([s2ab(wbout)], {
      type: 'application/octet-stream'
    }),
    filename + '.xlsx'
  );
}
// 计算列宽
export function getCellWidth(value) {
  if (value == null) {
    return 10
  } else if (value.toString().charCodeAt(0) > 255) {
    // 判断是否包含中文
    let length = value.toString().length * 2
    if (length > 60) {
      length = length - 40
      //这里的宽度可以自己设定，在前面设置wrapText: 1可以在单元格内换行
    }
    return length
  } else {
    return value.toString().length * 1.2
  }
}

3.页面中的使用

exportReport() {
       const loading = this.$loading({
        lock: true,
        text: 'Loading',
        spinner: 'el-icon-loading',
        background: 'rgba(0, 0, 0, 0.7)',
      });
      exportTiCategoryExcelData(this.param)
        .then((res) => {
          loading.close();
          if (res.data.code == 0) {
            let tabData = res.data.data;
            let thead = ['严重级别','类型','关联请求方', '线路', '请求数'];
            let keys = ['level','category','client', 'view', 'count'];
            /* 导出表格 */
            import('@/utils/exportExcel').then((excel) => {
              const theader = JSON.parse(JSON.stringify(thead));
              const filterVal = JSON.parse(JSON.stringify(keys));
              const data = this.formatJSON(
                filterVal,
                JSON.parse(JSON.stringify(tabData))
              );
              excel.export_json_to_excel({
                header: theader,
                data,
                filename: '威胁事件视角',
              });
            });
          }
        })
        .catch(() => {
          loading.close();
        });
    },
    formatJSON(filterVal, jsonData) {
      return jsonData.map((v) =>
        filterVal.map((j) => {
          return v[j];
        })
      );
    },

-图中是一些，excel 样式设置属性


4.导出单个excel文件含有多张表
exportExcel.js增加了导出多张表的代码

// 导出多个sheet
export function export2ExcelMultiSheet(jsonData, defaultTitle) {
  let data = jsonData;
  //添加标题
  for (let item of data) {
      item.data.unshift(item.th);
  }
 
  let wb = new Workbook();
  //生成多个sheet
  for (let item of data) {
      wb.SheetNames.push(item.sheetTitle)
      let ws=sheet_from_array_of_arrays(item.data)
      let header=item.th
      let colWidths = [];
    // 计算每一列的所有单元格宽度
    // 先遍历行
    item.data.forEach((row) => {
      // 列序号
      let index = 0
      // 遍历列
      for (const key in row) {
        if (colWidths[index] == null) colWidths[index] = []
        switch (typeof row[key]) {
          case 'string':
          case 'number':
          case 'boolean':
            // 判断数据是否有\n，且自动换行
            var reg = RegExp(/\n/);
            if(reg.test(row[key])){
              let result=row[key].split('\n')
              let arr=result.map((v)=>{
                return v.length
              })
              let maxIndex=Math.max(...arr);
              let indexs=result.findIndex(ele=>ele.length==maxIndex)
              // 判断是否为中文
              if(result[indexs].toString().charCodeAt(0) > 255){
                colWidths[index].push(result[indexs].toString().length*2)
              }else{
                colWidths[index].push(result[indexs].length)
              }
            }else{
              colWidths[index].push(getCellWidth(row[key]))
            }    
            break
          case 'object':
          case 'function':
            colWidths[index].push(0)
            break
        }
        index++
      }
    })
    ws['!cols'] = [];
    colWidths.forEach((widths, index) => {
      // 计算列头的宽度
      widths.push(getCellWidth(header[index]))
      // 设置最大值为列宽
      ws['!cols'].push({
        wch: Math.max(...widths).toFixed(0)
      })
    })
      wb.Sheets[item.sheetTitle] = ws;
  }
 
  var wbout = XLSX.write(wb, {bookType: 'xlsx', bookSST: false, type: 'binary'});
  var title = defaultTitle || '列表'
  saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), title + ".xlsx")
}

5.页面引用

 exportExcel(tableDataAll,tableDataTime,tableDataAddr){
       // 要导出的数据中 对应的key
      let filterVal = Object.keys(this.classfiys);   
      let filterVal2 = ['time'].concat(Object.keys(this.classfiys))   
      let filterVal3 = ['addr'].concat(Object.keys(this.classfiys))  
      let tableAll=[]
      let obj={}
      for (const key in tableDataAll) {
        if (Object.hasOwnProperty.call(tableDataAll, key)) {
          const element = tableDataAll[key];
          if(key!=='addr_data'&&key!=='time_data'){
            obj[key]=element
          }
        }
      }
      tableAll.push(obj)
      let result = [
        {
          th: Object.values(this.classfiys), //表头
          data: this.formatJSON(filterVal, tableAll), //格式化的数据
          sheetTitle: "全部",// sheet名称
        },
        {
          th: ["时间"].concat(Object.values(this.classfiys)),
          data: this.formatJSON(filterVal2, tableDataTime),
          sheetTitle: "时间",
        },
        {
          th: ["地址"].concat(Object.values(this.classfiys)),
          data: this.formatJSON(filterVal3, tableDataAddr),
          sheetTitle: "地址",
        },
      ];
      require.ensure([], () => {
        let { export2ExcelMultiSheet } = require("@/utils/exportExcel");
        export2ExcelMultiSheet(result, "告警报表");
      });
    },
     formatJSON(filterVal, jsonData) {
      return jsonData.map(v =>
        filterVal.map(j => {
          return v[j];
        })
      );
    },

• 参考地址
  https://blog.csdn.net/qq_42688511/article/details/122732575?spm=1001.2101.3001.6650.2&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-2.pc_relevant_aa&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-2.pc_relevant_aa&utm_relevant_index=5
  https://blog.csdn.net/FE_dev/article/details/106396416