excel转数据

不念不忘少年蓝@ 2022-04-04 11:51 191阅读 0赞

### 最近找了个vue的Excel数据读取的案例，初次创作，勿喷 ###

安装依赖

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

引入js文件

import blob from './../excel/Blob'
      import ex from './../excel/Export2Excel'

添加HTML标签

添加转换函数

methods:{
              importfxx(obj) {
            // npm install -D script-loader
            // npm install -S file-saver xlsx
            // import blob from './../excel/Blob'
            // import ex from './../excel/Export2Excel'
            // <input id="upload" type="file" @change="importfxx(this)" accept=".csv, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel" />
    
            let _this = this;
            this.file = event.currentTarget.files[0];// 通过DOM取文件数据
            var rABS = false; //是否将文件读取为二进制字符串
            var f = this.file;
    
            var reader = new FileReader();
            //if (!FileReader.prototype.readAsBinaryString) {
            FileReader.prototype.readAsBinaryString = function(f) {
              var binary = "";
              var rABS = false; //是否将文件读取为二进制字符串
              var pt = this;
              var wb; //读取完成的数据
              var outdata;
              var reader = new FileReader();
              reader.onload = function(e) {
                var bytes = new Uint8Array(reader.result);
                var length = bytes.byteLength;
                for (var i = 0; i < length; i++) {
                  binary += String.fromCharCode(bytes[i]);
                }
                var XLSX = require("xlsx");
                if (rABS) {
                  wb = XLSX.read(btoa(fixdata(binary)), {
                    //手动转化
                    type: "base64"
                  });
                } else {
                  wb = XLSX.read(binary, {
                    type: "binary"
                  });
                }
                outdata = XLSX.utils.sheet_to_json(wb.Sheets[wb.SheetNames[0]]); //outdata就是你想要的东西
                console.log(outdata)
              };
              reader.readAsArrayBuffer(f);
            };
            if (rABS) {
              reader.readAsArrayBuffer(f);
            } else {
              reader.readAsBinaryString(f);
            }
          },
    
    }

blob.js文件代码如下

Export2Excel.js代码如下

require('script-loader!file-saver');
    require('./Blob');
    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")
    }

### 效果图如下 ###

Excel文件：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjkyMzQ5_size_16_color_FFFFFF_t_70][]

选择Excel文件

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjkyMzQ5_size_16_color_FFFFFF_t_70 1][]

转换结果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjkyMzQ5_size_16_color_FFFFFF_t_70 2][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjkyMzQ5_size_16_color_FFFFFF_t_70]: /images/20220404/666a5c007467465aa65050b720aee8c7.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjkyMzQ5_size_16_color_FFFFFF_t_70 1]: /images/20220404/c54edec50f9544fa957b94c80f2f7c01.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNjkyMzQ5_size_16_color_FFFFFF_t_70 2]: /images/20220404/4c211c900c6d4abba28a73b2b8a48a2e.png