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vue使用Export2Excel纯前端多次请求数据使用Promise合并数据并导出

使用Export2Excel导出表格demo

使用还需要安装两个依赖,npm install xlsx --save 和 npm install file-saver --save,这里需要注意下,如果xlsx的版本高了的话配置里面的utils可能会报错,所以只需要将xlsx的版本安装一个固定版本就行了,我这里测试安装0.17.5版本没问题可以不会报错,npm install xlsx@^0.17.5安装到这个固定版本指令

    <template>
    <div class="content">
        <el-button 
                 type="primary" 
                 :loading="exportLoading"
                 @click="exportData"
                 >信息导出
        </el-button>
        <el-button 
                 type="success" 
                 :loading="exportLoading"
                 @click="exportDatas"
                 >测试导出
        </el-button>
    </div>
</template>
<script>
import { export_json_to_excel} from '../../vendor/Export2Excel.js'。// 创建一个文件放入Export2Excel配置的js文件,然后在这里引入就行

export default {
    data(){
        return {
            tHeader:['姓名','性别','手机号码','家庭地址','最后登陆时间'],
            filterVal:['name','gender','mobelNo','address','lastTime'],
            tableDatas:[{'name':'李佳佳','gender':'女','mobelNo':'13509090909','address':'成都市青羊区抚琴小区','lastTime':'18:02:00'},
            {'name':'王玉珊','gender':'女','mobelNo':'13509090808','address':'成都市青羊区抚琴小区','lastTime':'18:09:00'},
            {'name':'张嘉琪','gender':'男','mobelNo':'13509090606','address':'成都市青羊区瑞莲路','lastTime':'18:08:00'}],
            exportLoading:false,
        }
    },
    methods:{
        exportData(){
               let paramData={
                   'data':{
                        'phone':'',
                        'smsCode':'',
                        'areaCode':''
                   },
                   'pageNum':1,
                   'pageSize':100
               }
               this.$axios({
                     url:'输入实际的地址',
                     method:'post',
                     data:paramData
               }).then((res)=>{
                      this.tableData=[]
                      this.total=res.total;
                      this.tableData.push(...res.list)  // 获取到初次查询的数据push到接收的数组中
                      if(res.isLastPage){  // 如果查询数据是最后一页就直接下载
                            let data=this.formatJson(this.filterVal,this.tableData)
                            export_json_to_excel({
                                header:this.tHeader,
                                data,
                                filename:'登陆信息导出'
                            })
                            this.exportLoading=false
                      }else{  // 如果数据很多这里就需要分页查询汇总再导出使用到了Promise来进行多次请求合并
                            let count=Math.ceil(res.total/100);
                            let promiseList=[];
                            for(let i=1;i<=count;i++){
                                let num=i+1
                                let paramData={
                                    'data':{
                                          'phone':'',
                                          'smsCode':'',
                                          'areaCode':''
                                    },
                                    'pageNum':num,
                                    'pageSize':100
                                }
                                let p=new Promise((resolve,reject)=>{
                                        this.$axios({
                                            url:"同上路径",
                                            method:'post',
                                            data:paramData
                                        }).then((result)=>{
                                               resolve(result)
                                        }).catch((e)=>{
                                               reject(e)
                                        })
                                })
                                promiseList.push(p)
                            };
                            Promise.all(promiseList).then((res)=>{
                                  res.forEach((item)=>{
                                       this.tableData.push(...item.list)
                                  })
                            })
                            this.$loading({}).close();
                            let data=this.formatJson(this.filterVal,this.tableData)
                            export_json_to_excel({
                                  header:this.tHeader,
                                  data,
                                  filename:'登陆信息导出'
                            })
                            this.exportLoading=false
                      }
               }).catch((e)=>{
                       if(e){
                            this.exportLoading=false;
                            this.$message({
                                showClose:true,
                                message:'下载失败!',
                                type:'warning'
                            })
                       }
               })
        },
        exportDatas(){
                            let data=this.formatJson(this.filterVal,this.tableDatas)
                            export_json_to_excel({
                                  header:this.tHeader,
                                  data,
                                  filename:'登陆信息导出'
                            })
        },
        // 导出配置
        formatJson(filterVal,jsonData){
               return jsonData.map(v=>
                    filterVal.map(j=>{
                        if(j==="timestamp"){
                            return parseTime(v[j])
                        }else{
                            return v[j]
                        }
                    })
               )
        }
    }

}
</script>
<style>
       .content{
            height: 80vh;
            display: flex;
            justify-content: center;
            align-items: center;
       }
    
</style>
    ## Export2Excel文件配置
    /* 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 = [],
  multiHeader2 = [],
  header,
  data,
  filename,
  merges = [],
  autoWidth = true,
  bookType = 'xlsx'
} = {}) {
  /* original data */
  filename = filename || 'excel-list'
  data = [...data]
  data.unshift(header);
  for (let i = multiHeader2.length - 1; i > -1; i--) {
    data.unshift(multiHeader2[i])
  }
  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}`);
}


;