vue---将json导出Excel的方法

在做数据表格渲染的时候，经常遇到的需求的就是将导出excel，下面是使用vue进行项目数据进行导出的方法。

一、安装依赖

npm i -S file-saver
npm i -S xlsx

二、在src目录下新建utilsl文件夹，新建json2excel.js，并引入依赖

import { saveAs } from 'file-saver'
import XLSX from 'xlsx/dist/xlsx.full.min'

// 将json数据处理为xlsx需要的格式
function datenum(v, date1904) {
    if (date1904) v += 1462
    let epoch = Date.parse(v)
    return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000)
}
 
function data2ws(data) {
    const ws = {}
    const range = {s: {c: 10000000, r: 10000000}, e: {c: 0, r: 0}}
    for (let R = 0; R != data.length; ++R) {
        for (let 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
            const cell = { v: data[R][C] }
            if (cell.v == null) continue
            const 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
}
// 导出Excel
function Workbook() {
    if (!(this instanceof Workbook)) return new Workbook()
    this.SheetNames = []
    this.Sheets = {}
}
 
function s2ab(s) {
    const buf = new ArrayBuffer(s.length)
    const view = new Uint8Array(buf)
    for (let i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF
    return buf
}
 
/*
* th => 表头
* data => 数据
* fileName => 文件名
* fileType => 文件类型
* sheetName => sheet页名
*/
export default function toExcel ({th, data, fileName, fileType, sheetName}) {
    data.unshift(th)
    const wb = new Workbook(), ws = data2ws(data)
    sheetName = sheetName || 'sheet1'
    wb.SheetNames.push(sheetName)
    wb.Sheets[sheetName] = ws
    fileType = fileType || 'xlsx'
    var wbout = XLSX.write(wb, {bookType: fileType, bookSST: false, type: 'binary'})
    fileName = fileName || '列表'
    saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), `${fileName}.${fileType}`)
}

具体使用：

第一种方式：组件引入

<template>
  <div style="padding:40px;">
    <el-button type="primary" size="small" @click="downExcel">导出EXCEL</el-button>
  </div>
</template>

<script>
import toExcel from '@/utils/json2excel'
export default {
  name: "landing-page",
  data() {
    return {
      excelData: [
        {name: '张三',birthday: new Date('1990-01-01'),sex: '男',age: 28},
        {name: '李四',birthday: new Date('1991-01-01'),sex: '女',age: 27}
      ]
    };
  },
  mounted() {},
  methods: {
     downExcel() {
      const th = ['姓名', '生日', '性别', '年龄']
      const filterVal = ['name', 'birthday', 'sex', 'age']
      const data = this.excelData.map(v => filterVal.map(k => v[k]))
      const [fileName, fileType, sheetName] = ['测试下载', 'xlsx', '测试页']
      toExcel({th, data, fileName, fileType, sheetName})
    }
  }
};
</script>

第二种：全局挂载使用

1、在main.js中全局挂载toExcel方法

import toExcel from '@/excel/json2excel'
Vue.prototype.$toExcel = toExcel

2、在组件中调用toExcel方法导出excel

<template>
  <div style="padding:40px;">
    <el-button type="primary" size="small" @click="downExcel">导出EXCEL</el-button>
  </div>
</template>

<script>
import toExcel from '@/utils/json2excel'
export default {
  name: "landing-page",
  data() {
    return {
      excelData: [
        {name: '张三',birthday: new Date('1990-01-01'),sex: '男',age: 28},
        {name: '李四',birthday: new Date('1991-01-01'),sex: '女',age: 27}
      ]
    };
  },
  mounted() {},
  methods: {
     downExcel() {
      const th = ['姓名', '生日', '性别', '年龄']
      const filterVal = ['name', 'birthday', 'sex', 'age']
      const data = this.excelData.map(v => filterVal.map(k => v[k]))
      const [fileName, fileType, sheetName] = ['测试下载', 'xlsx', '测试页']
      this.$toExcel({th, data, fileName, fileType, sheetName})
    }
  }
};
</script>

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