Export2Excel--Excel导出功能

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1. 安装依赖

Export2Excel依赖js-xlsx、file-saver和script-loader。

安装命令：

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

由于js-xlsx体积还是很大的，导出功能也不是一个非常常用的功能，所以使用的时候建议使用懒加载。使用方法如下：

import('@/vendor/Export2Excel').then(excel => {
  excel.export_json_to_excel({
    header: tHeader, //表头 必填
    data, //具体数据 必填
    filename: 'excel-list', //非必填
    autoWidth: true, //非必填
    bookType: 'xlsx' //非必填
  })
})

2. 参数

参数	说明	类型	可选值	默认值
header	导出数据的表头	Array	/	[]
data	导出的具体数据	Array	/	[]
filename	导出文件名	String	/	excel-list
autoWidth	单元格是否要自适应宽度	Boolean	true / false	true
bookType	导出文件类型	String	xlsx, csv, txt, more	xlsx

3. 引入js文件

• src/utils/Export2Excel.js

/* 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 = "Sheet1";
    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}`);
}

4. 页面调用方法示例

• Log.vue

  导出日志示例

 methods: {
            //导出组局信息
            exportUsers(exportList) {
                import("../../../utils/Export2Excel").then((excel) => {
                    // 设置导出表格的头部
                    const tHeader = [
                        "日志序号",
                        "接口名称",
                        "接口参数",
                        "操作时间",
                        "操作人",
                        "操作者ip地址",
                        "状态",
                        "日志描述",
                    ];
                    // 将要导出的数据进行一个过滤
                    /**
                     * 源数据导入到excel的数据每一条重新拼成一个数组,数组里的每个元素就是filterVal里的每个字段
                     */
                    const data = exportList.map((item, index) => {
                        return [
                            index + 1,
                            item.implName,
                            item.param,
                            item.operateTime,
                            item.username,
                            item.ipAddress,
                            item.isSuccess,
                            item.operateDesc,
                        ];
                    });
                    // 调用我们封装好的方法进行导出Excel
                    excel.export_json_to_excel({
                        // 导出的头部
                        header: tHeader,
                        // 导出的内容
                        data,
                        // 导出的文件名称
                        filename: "日志列表",
                        // 导出的表格宽度是否自动
                        autoWidth: true,
                        // 导出文件的后缀类型
                        bookType: "xlsx",
                    })
                });
            },

            handleExport() {
                this.$confirm("是否确认导出当前所有日志?", "警告", {
                    confirmButtonText: "确定",
                    cancelButtonText: "取消",
                    type: "warning"
                }).then(() => {
                    this.exportLoading = true;
                    request({
                        url: "/log/export",
                        method: "post",
                        data: {
                            implName: this.query.implName,
                            username: this.query.username,
                            ipAddress: this.query.ipAddress,
                            isSuccess: this.query.isSuccess,
                        },
                    }).then((res) => {
                        this.exportUsers(res.data.data);
                    }).then(() => {
                        this.$message.success("导出成功");
                        this.exportLoading = false;
                    }).catch((err) => {
                        this.exportLoading = false;
                        this.$message.error("导出异常");
                    });
                })
            },
},

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参考：vue-element-admin - Excel 导出