vue+element + table將選中的資料匯出為excel（匯出的是當前頁選中的資料）

1、安裝外掛

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

2、在src資料夾下新建 excel資料夾，並在excel資料夾下新建 Blob.js 和 Export2Excel.js

3、使用：
（1） 如果專案中有很多地方用到匯出資料成表格，則在 main.js中引入 Blob.js 和 Export2Excel.js（文章結尾處附 Blob.js 和 Export2Excel.js 程式碼）

//在main.js中
// 注意引入 Blob.js 和 Export2Excel.js 的路徑
import Blob from './excel/Blob.js'    
import Export2Excel from './excel/Export2Excel.js'

（2） 如果專案中只有一個地方用到，則在要使用到的頁面裡引入：

4、以下以在專案中的某一個地方使用為例：

<template>
  <div>
    <el-button size="mini" type="primary" @click="handleExport">匯出</el-button>    

    <el-table id="export-table" :data="tableData" style="width: 100%" @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="50" align="center"></el-table-column>
      <el-table-column prop="userName" label="姓名" width="120" align="center" :show-overflow-tooltip="true"></el-table-column>
      <el-table-column prop="sex" label="性別" width="60" align="center" :show-overflow-tooltip="true">
        <template slot-scope="scope">{{scope.row.sex | sexList}}</template>
      </el-table-column>
      <el-table-column prop="jobName" label="應聘崗位" width="180" align="center" :show-overflow-tooltip="true"></el-table-column>
      <el-table-column prop="workAge" label="工作經驗" width="80" align="center" :show-overflow-tooltip="true">
        <template slot-scope="scope">{{scope.row.workAge === 0 ? '無' : scope.row.workAge+ '年' }}</template>
      </el-table-column>
      <el-table-column prop="eduLevelName" label="學歷" width="100" align="center" :show-overflow-tooltip="true"></el-table-column>
      <el-table-column label="操作" width="100" align="center">
        <template slot-scope="scope">
          <el-button @click="handleClick(scope.row)" type="text" size="small" class="other-color">檢視</el-button>
        </template>
      </el-table-column>
    </el-table>
  </div>
</template>

<script>
import { shortTime } from "@/utils/tool";
import Blob from '@/excel/Blob'
import Export2Excel from '@/excel/Export2Excel.js'
export default {
  data() {
    return {
      selectList: [],  // 選中的資料
    }
  },

  methods: {
    //選中某條資料時
    handleSelectionChange(row) {
      this.selectList = row;     // 將選中的資料給selectList
      //   console.log(this.selectList)
    },
    handleExport() {
      if (this.selectList.length === 0) {
        this.$message({
          message: '請至少選擇一條需要匯出的資料',
          type: 'warning'
        });
        return;
      }
      this.$confirm('該操作將匯出選中的資料，是否繼續', '提示', {
        confirmButtonText: '確定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        //匯出
        require.ensure([], () => {
          const { export_json_to_excel } = require('@/excel/Export2Excel');   //注意這個Export2Excel路徑
          const tableHeader = ['姓名', '性別', '應聘崗位', '工作經驗', '學歷'];   // 設定Excel表格的表頭
          const filterVal = ['userName', 'sex', 'jobName', 'workAge', 'eduLevelName'];  // 跟表格表頭對應的繫結的prop
          let list = this.filterTableData(JSON.parse(JSON.stringify(this.selectList)));   // this.selectList為選中的要匯出的資料，用filterTableData方法先處理一下資料格式(要進行深度拷貝，以免過濾的時候，影響頁面上展示的資料)，再存到list
          let data = this.formatJson(filterVal, list);
          export_json_to_excel(tableHeader, data, '簡歷');    //最後一個是匯出表格的名字
        })
      }).catch(() => { });
    },
    formatJson(filterVal, Data) {
      return Data.map(v => filterVal.map(j => v[j]))
    },
    //匯出資料前對資料處理
    filterTableData(data) {
      data.forEach(item => {
        item.applyDate = shortTime(item.applyDate)   // 將匯出的時間轉換成'YYYY-MM-DD'格式
        item.workAge = item.workAge + '年'
      })
      return data;
    }
  }
}
</script>

Blob.js

/*global self, unescape */
/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
 plusplus: true */
(function(view) {
  "use strict";

  view.URL = view.URL || view.webkitURL;

  if (view.Blob && view.URL) {
    try {
      new Blob();
      return;
    } catch (e) {}
  }

  // Internally we use a BlobBuilder implementation to base Blob off of
  // in order to support older browsers that only have BlobBuilder
  var BlobBuilder =
    view.BlobBuilder ||
    view.WebKitBlobBuilder ||
    view.MozBlobBuilder ||
    (function(view) {
      var get_class = function(object) {
          return Object.prototype.toString
            .call(object)
            .match(/^\[object\s(.*)\]$/)[1];
        },
        FakeBlobBuilder = function BlobBuilder() {
          this.data = [];
        },
        FakeBlob = function Blob(data, type, encoding) {
          this.data = data;
          this.size = data.length;
          this.type = type;
          this.encoding = encoding;
        },
        FBB_proto = FakeBlobBuilder.prototype,
        FB_proto = FakeBlob.prototype,
        FileReaderSync = view.FileReaderSync,
        FileException = function(type) {
          this.code = this[(this.name = type)];
        },
        file_ex_codes = (
          "NOT_FOUND_ERR SECURITY_ERR ABORT_ERR NOT_READABLE_ERR ENCODING_ERR " +
          "NO_MODIFICATION_ALLOWED_ERR INVALID_STATE_ERR SYNTAX_ERR"
        ).split(" "),
        file_ex_code = file_ex_codes.length,
        real_URL = view.URL || view.webkitURL || view,
        real_create_object_URL = real_URL.createObjectURL,
        real_revoke_object_URL = real_URL.revokeObjectURL,
        URL = real_URL,
        btoa = view.btoa,
        atob = view.atob,
        ArrayBuffer = view.ArrayBuffer,
        Uint8Array = view.Uint8Array;
      FakeBlob.fake = FB_proto.fake = true;
      while (file_ex_code--) {
        FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1;
      }
      if (!real_URL.createObjectURL) {
        URL = view.URL = {};
      }
      URL.createObjectURL = function(blob) {
        var type = blob.type,
          data_URI_header;
        if (type === null) {
          type = "application/octet-stream";
        }
        if (blob instanceof FakeBlob) {
          data_URI_header = "data:" + type;
          if (blob.encoding === "base64") {
            return data_URI_header + ";base64," + blob.data;
          } else if (blob.encoding === "URI") {
            return data_URI_header + "," + decodeURIComponent(blob.data);
          }
          if (btoa) {
            return data_URI_header + ";base64," + btoa(blob.data);
          } else {
            return data_URI_header + "," + encodeURIComponent(blob.data);
          }
        } else if (real_create_object_URL) {
          return real_create_object_URL.call(real_URL, blob);
        }
      };
      URL.revokeObjectURL = function(object_URL) {
        if (object_URL.substring(0, 5) !== "data:" && real_revoke_object_URL) {
          real_revoke_object_URL.call(real_URL, object_URL);
        }
      };
      FBB_proto.append = function(data /*, endings*/) {
        var bb = this.data;
        // decode data to a binary string
        if (
          Uint8Array &&
          (data instanceof ArrayBuffer || data instanceof Uint8Array)
        ) {
          var str = "",
            buf = new Uint8Array(data),
            i = 0,
            buf_len = buf.length;
          for (; i < buf_len; i++) {
            str += String.fromCharCode(buf[i]);
          }
          bb.push(str);
        } else if (get_class(data) === "Blob" || get_class(data) === "File") {
          if (FileReaderSync) {
            var fr = new FileReaderSync();
            bb.push(fr.readAsBinaryString(data));
          } else {
            // async FileReader won't work as BlobBuilder is sync
            throw new FileException("NOT_READABLE_ERR");
          }
        } else if (data instanceof FakeBlob) {
          if (data.encoding === "base64" && atob) {
            bb.push(atob(data.data));
          } else if (data.encoding === "URI") {
            bb.push(decodeURIComponent(data.data));
          } else if (data.encoding === "raw") {
            bb.push(data.data);
          }
        } else {
          if (typeof data !== "string") {
            data += ""; // convert unsupported types to strings
          }
          // decode UTF-16 to binary string
          bb.push(unescape(encodeURIComponent(data)));
        }
      };
      FBB_proto.getBlob = function(type) {
        if (!arguments.length) {
          type = null;
        }
        return new FakeBlob(this.data.join(""), type, "raw");
      };
      FBB_proto.toString = function() {
        return "[object BlobBuilder]";
      };
      FB_proto.slice = function(start, end, type) {
        var args = arguments.length;
        if (args < 3) {
          type = null;
        }
        return new FakeBlob(
          this.data.slice(start, args > 1 ? end : this.data.length),
          type,
          this.encoding
        );
      };
      FB_proto.toString = function() {
        return "[object Blob]";
      };
      FB_proto.close = function() {
        this.size = this.data.length = 0;
      };
      return FakeBlobBuilder;
    })(view);

  view.Blob = function Blob(blobParts, options) {
    var type = options ? options.type || "" : "";
    var builder = new BlobBuilder();
    if (blobParts) {
      for (var i = 0, len = blobParts.length; i < len; i++) {
        builder.append(blobParts[i]);
      }
    }
    return builder.getBlob(type);
  };
})(
  (typeof self !== "undefined" && self) ||
    (typeof window !== "undefined" && window) ||
    this.content ||
    this
);

Export2Excel.js ： 在 Export2Excel.js 程式碼裡面有引入 Blob，注意引入時的路徑

//Export2Excel.js
require("script-loader!file-saver");
require("script-loader!./Blob"); //轉二進位制用  引入專案中的blob的實際路徑
require("script-loader!xlsx/dist/xlsx.core.min");

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);
  console.log("a");
  var oo = generateArray(theTable);
  var ranges = oo[1];

  /* original data */
  var data = oo[0];
  var ws_name = "SheetJS";
  console.log(data);

  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"
  );
}

function formatJson(jsonData) {
  console.log(jsonData);
}
export function export_json_to_excel(th, jsonData, defaultTitle) {
  /* original data */

  var data = jsonData;
  data.unshift(th);
  var ws_name = "SheetJS";

  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data);

  /* 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"
  });
  var title = defaultTitle || "列表";
  saveAs(
    new Blob([s2ab(wbout)], {
      type: "application/octet-stream"
    }),
    title + ".xlsx"
  );
}