[JavaScript知识库]vue导出查询结果

    import {export_array_to_excel} from "@/libs/excel";

    <div slot="buttons">
                <Button slot="buttons" type="primary" icon="md-arrow-down" class="function" @click="exportExcel">
                    导出查询结果
                </Button>
            </div>

   exportExcel() {
                let params = this.formData.params;
                api.request({
                    url: `-------------`,
                    method: 'POST',
                    data: params
                }).then(res => {
                    if (res.data) {
                        // console.log(JSON.stringify(res.data));
                        let columns = this.formData.columns;
                        let headers = [];
                        let keys = [];
                        for (let i = 0; i < columns.length; i++) {
                            headers.push(columns[i].title);
                            keys.push(columns[i].key);
                        }
                        export_array_to_excel({
                            data: res.data, //数据
                            key: keys,
                            title: headers, //文档头部
                            filename: '', //文档名称
                            autoWidth: true
                        });
                    }

                });
            },

excel.js

/* eslint-disable */
import XLSX from 'xlsx';

function auto_width(ws, data) {
    /*set worksheet max width per col*/
    const colWidth = data.map(row => row.map(val => {
        /*if null/undefined*/
        if (val == null) {
            return {'wch': 10};
        }
        /*if chinese*/
        else if (val.toString().charCodeAt(0) > 255) {
            return {'wch': val.toString().length * 2};
        } else {
            return {'wch': val.toString().length};
        }
    }))
    /*start in the first row*/
    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;
}
function json_to_array(key, jsonData) {
    return jsonData.map(v => key.map(j => {
        return v[j]
    }));
}
// fix data,return string
function fixdata(data) {
    let o = ''
    let l = 0
    const w = 10240
    for (; l < data.byteLength / w; ++l) o += String.fromCharCode.apply(null, new Uint8Array(data.slice(l * w, l * w + w)))
    o += String.fromCharCode.apply(null, new Uint8Array(data.slice(l * w)))
    return o
}
// get head from excel file,return array
function get_header_row(sheet) {
    const headers = []
    const range = XLSX.utils.decode_range(sheet['!ref'])
    let C
    const R = range.s.r
    /* start in the first row */
    for (C = range.s.c; C <= range.e.c; ++C) { /* walk every column in the range */
        var cell = sheet[XLSX.utils.encode_cell({c: C, r: R})]
        /* find the cell in the first row */
        var hdr = 'UNKNOWN ' + C // <-- replace with your desired default
        if (cell && cell.t) hdr = XLSX.utils.format_cell(cell)
        headers.push(hdr)
    }
    return headers
}
export const export_table_to_excel = (id, filename) => {
    const table = document.getElementById(id);
    const wb = XLSX.utils.table_to_book(table);
    XLSX.writeFile(wb, filename);
    /* the second way */
    // const table = document.getElementById(id);
    // const wb = XLSX.utils.book_new();
    // const ws = XLSX.utils.table_to_sheet(table);
    // XLSX.utils.book_append_sheet(wb, ws, filename);
    // XLSX.writeFile(wb, filename);
}
export const export_json_to_excel = ({data, key, title, filename, autoWidth}) => {
    const wb = XLSX.utils.book_new();
    data.unshift(title);
    const ws = XLSX.utils.json_to_sheet(data, {header: key, skipHeader: true});
    if (autoWidth) {
        const arr = json_to_array(key, data);
        auto_width(ws, arr);
    }
    XLSX.utils.book_append_sheet(wb, ws, filename);
    XLSX.writeFile(wb, filename + '.xlsx');
}
export const export_array_to_excel = ({key, data, title, filename, autoWidth}) => {
    const wb = XLSX.utils.book_new();
    const arr = json_to_array(key, data);
    arr.unshift(title);
    const ws = XLSX.utils.aoa_to_sheet(arr);
    if (autoWidth) {
        auto_width(ws, arr);
    }
    XLSX.utils.book_append_sheet(wb, ws, filename);
    XLSX.writeFile(wb, filename + '.xlsx');
}
export const read = (data, type) => {
    /* if type == 'base64' must fix data first */
    // const fixedData = fixdata(data)
    // const workbook = XLSX.read(btoa(fixedData), { type: 'base64' })
    const workbook = XLSX.read(data, {type: type});
    const firstSheetName = workbook.SheetNames[0];
    const worksheet = workbook.Sheets[firstSheetName];
    const header = get_header_row(worksheet);
    const results = XLSX.utils.sheet_to_json(worksheet);
    return {header, results};
}
export default {
    export_table_to_excel,
    export_array_to_excel,
    export_json_to_excel,
    read
}