前沿
最近再寫vue-element-ui-pc項(xiàng)目中需要把數(shù)據(jù)導(dǎo)出為excel的需求技健，于是乎就開始折騰唄，沒辦法惜傲，誰讓之前沒有寫過vue的導(dǎo)出數(shù)據(jù)呢屡贺，不折騰的攻城獅跟病貓有什么區(qū)別，不多說了竟贯，上思路與代碼答捕。
好在折騰了兩天發(fā)現(xiàn)了js-xlsx這個東東，一個功能很強(qiáng)大excel處理庫屑那，只是下載各種格式excel拱镐，還支持讀取excel，于是我就借鑒官網(wǎng)的例子搞了一下持际，其實(shí)原理我也不太懂痢站，只是在使用造好的輪子而已。
寫在開始选酗，在本插件中需要注意到的幾個地方
以下為需要用到的插件庫
npm install file-saver@1.3.3 用來保存文件的
npm install --save-dev script-loader 由于由于這幾個文件不支持import引入阵难，所以我們需要`script-loader`來將他們掛載到全局環(huán)境下。
npm install xlsx //就是上邊提到的js-xlsx這個東東
npm install jszip //導(dǎo)出為壓縮文件////或者是將文件壓縮
Step 一
首先芒填，先創(chuàng)建一個公共文件夾呜叫，里邊存放封裝的公共的導(dǎo)出的js,這里起名為vendor,里邊放三個封裝好的文件，分別為
1殿衰，Blog.js
//Blog.js官網(wǎng)寫好的朱庆，直接用就好了，主要是用來轉(zhuǎn)二進(jìn)制用的闷祥。
/* eslint-disable */
(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));
2娱颊，Export2Excel.js
//主要是處理好數(shù)據(jù)并且暴露了兩個接口export_table_to_excel和export_json_to_excel,我們常用export_json_to_excel因?yàn)楦拥目煽匾稽c(diǎn)，我們可以自由的洗數(shù)據(jù)凯砍。
/* eslint-disable */
require('script-loader!file-saver');
require('script-loader!@/vendor/Blob');
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({ header, data, filename = 'excel-list', autoWidth = true } = {}) {
/* original data */
data = [...data]
data.unshift(header);
var ws_name = "SheetJS";
var wb = new Workbook(),
ws = sheet_from_array_of_arrays(data);
if (autoWidth) {
/*設(shè)置worksheet每列的最大寬度*/
const colWidth = data.map(row => row.map(val => {
/*先判斷是否為null/undefined*/
if (val == null) {
return { 'wch': 10 };
}
/*再判斷是否為中文*/
else if (val.toString().charCodeAt(0) > 255) {
return { 'wch': val.toString().length * 2 };
} else {
return { 'wch': val.toString().length };
}
}))
/*以第一行為初始值*/
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: 'xlsx', bookSST: false, type: 'binary' });
saveAs(new Blob([s2ab(wbout)], { type: "application/octet-stream" }), filename + ".xlsx");
}
2箱硕，Export2Zip.js
//暴漏出export_txt_to_zip這個接口，用來到處壓縮文件的
/* eslint-disable */
require('script-loader!file-saver');
import JSZip from 'jszip'
export function export_txt_to_zip(th, jsonData, txtName, zipName) {
const zip = new JSZip()
const txt_name = txtName || 'file'
const zip_name = zipName || 'file'
const data = jsonData
let txtData = `${th}\r\n`
data.forEach((row) => {
let tempStr = ''
tempStr = row.toString()
txtData += `${tempStr}\r\n`
})
zip.file(`${txt_name}.txt`, txtData)
zip.generateAsync({type:"blob"}).then((blob) => {
saveAs(blob, `${zip_name}.zip`)
}, (err) => {
alert('導(dǎo)出失敗')
})
}
接下來就是在頁面中使用了
<el-button type="warning"
style="width:100px;height:36px;"
ref="btn"
@click='ExportData'>導(dǎo)出數(shù)據(jù)</el-button>
<script>
export default {
data() {
return {
list: [
{
author: "Carol",
comment_disabled: true,
content_short: "我是測試數(shù)據(jù)",
display_time: "1974-06-19 10:01:57",
forecast: 71.85,
id: 1,
importance: 2,
pageviews: 1670,
reviewer: "Ruth",
status: "deleted",
timestamp: 1126391703464,
title: "哦i啥v就開始對方能看出來市場v恐龍世界",
type: "JP"
}
],
listLoading: true,
downloadLoading: false,
filename: "",
autoWidth: true
};
},
methods: {
ExportData() {
console.log("導(dǎo)出數(shù)據(jù)");
import("@/vendor/Export2Excel").then(excel => {
//表格的表頭列表
const tHeader = ["Id", "Title", "Author", "Readings", "Date"];
//與表頭相對應(yīng)的數(shù)據(jù)里邊的字段
const filterVal = [
"id",
"title",
"author",
"pageviews",
"display_time"
];
const list = this.list;
const data = this.formatJson(filterVal, list);
//這里還是使用export_json_to_excel方法比較好悟衩，方便操作數(shù)據(jù)
excel.export_json_to_excel({
header: tHeader,
data,
filename: this.filename,
autoWidth: this.autoWidth
});
this.downloadLoading = false;
});
},
//洗數(shù)據(jù)
formatJson(filterVal, jsonData) {
return jsonData.map(v =>
filterVal.map(j => {
// if (j === "timestamp") {
// return parseTime(v[j]);
// } else {
return v[j];
// }
})
);
},
}
};
</script>
結(jié)束語
至此剧罩，vue的到處excel就搞好了，其他兩個座泳，本次沒有寫demo,后期更新時會更新惠昔。還是那句話遇到需求幕与，要迎接需求，折騰幾次就好了镇防。將本次折騰的結(jié)果記錄下來啦鸣，方便自己總結(jié)也希望可以幫助到小伙伴們。
要用公共組件請看更新的vue-xlsx 導(dǎo)出數(shù)據(jù)公共組件
