1、安装3个插件 （file-saver、 xlsx、script-loader）
npm install -S file-saver xlsx
npm install -D script-loader2、在utils目录下新建一个 Export2Excel.js 脚本 （我的路径在@/utils/Export2Excel.js）
/* eslint-disable */
import { saveAs } from "file-saver";
// import XLSX from 'xlsx'
import * as 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;
}
// 该方法负责将数组转化成二维数组
export function formatJson(headers, rows) {
//首先遍历数组
return rows.map((item) => {
// item是对象 => 转化成只有值的数组 => 数组值的顺序依赖headers {username: '张三' }
// Object.keys(headers) => ["姓名", "手机号",...]
return Object.keys(headers).map((key) => {
return item[headers[key]]; // 得到 ['张三'，’129‘，’dd‘,'dd']
});
});
}
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 = "SheetJS";
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,
};
} else if (val.toString().charCodeAt(0) > 255) {
/*再判断是否为中文*/
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}`
);
}
3、在vue组件中使用
<el-button type="warning" plain icon="el-icon-download" size="mini" @click="handleExportCheckedRows">导出</el-button>/* 按需导出 */
handleExportCheckedRows(){
// 需要时再导入
import('@/utils/Export2Excel').then(excel => {
let headers = {
"信息1": "info1",
"信息2": "info2",
"信息3": "info3",
"信息4": "info4",
};
let data = [
{
"info1": 1,
"info2": 2,
"info3": 3,
"info4": 4,
},
{
"info1": 5,
"info2": 6,
"info3": 7,
"info4": 8,
},
{
"info1": 9,
"info2": 10,
"info3": 11,
"info4": 12,
},
]
let finalData = excel.formatJson(headers, data);
excel.export_json_to_excel({
header: Object.keys(headers), //表头 必填
data: finalData, //具体数据 必填
filename: `表名`, //非必填
autoWidth: true, //非必填
bookType: 'xlsx' //非必填
})
})
},4、导出效果如下
5、附加链接 el-table，勾选行，切到其他页码又切回来，如何自动勾选之前选过的行-CSDN博客
