vue基于Blob.js和 Export2Excel.js做前端导出

怼烎@ 2023-03-01 12:57 225阅读 0赞

**1安装三个依赖包**

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

**2导入两个js**  
下载Blob.js和Export2Excel.js，在src目录下新建Excel文件夹，里面放入Blob.js和Export2Excel.js两个JS文件，下面有  
![在这里插入图片描述][20200726144525772.png]  
**Blob.js**

/* eslint-disable */
    /* Blob.js
     * A Blob implementation.
     * 2014-05-27
     *
     * By Eli Grey, http://eligrey.com
     * By Devin Samarin, https://github.com/eboyjr
     * License: X11/MIT
     *   See LICENSE.md
     */
    
    /*global self, unescape */
    /*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
     plusplus: true */
    
    /*! @source http://purl.eligrey.com/github/Blob.js/blob/master/Blob.js */
    
    (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**

/* eslint-disable */
    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")
    }

**3main.js 引入文件**

import Blob from './Excel/Blob'
    import Export2Excel from './Excel/Export2Excel.js'

**4.组件中使用**

exportExcel() { 
            let params = { 
              province: this.province,
              city: this.city,
              pageNo: this.currentPage,
              count: this.pagesize,
              token: JSON.parse(sessionStorage.getItem("token"))
            };
            this.$http.post(url.exportDriverinfo, params, { 
              responseType: "arraybuffer"
            }).then((res) => { 
              console.log(res)
              let blob = new Blob([res.data], { 
                type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8'
              });
              var filename = "用户地域分布.xls";
              if (this.province) { 
                filename = "用户地域分布-" + this.province + ".xls";
              }
              var a = document.createElement('a');
              var url = window.URL.createObjectURL(blob);
              a.href = url;
              a.download = filename;
              var body = document.getElementsByTagName('body')[0];
              body.appendChild(a);
              a.click();
              body.removeChild(a);
              window.URL.revokeObjectURL(url);
            });
          }

[20200726144525772.png]: /images/20230208/d06935bd3acd435699855cb579224132.png