实现Vue3/Nuxt3 预览excel文件

npm install xlsx

<template>
<div>
<input type="file" @change="handleFileUpload" />
<table v-if="sheetData.length">
<thead><tr><th v-for="(header, index) in sheetData[0]" :key="index">{{ header }}</th></tr></thead>
<tbody><tr v-for="(row, rowIndex) in sheetData.slice(1)" :key="rowIndex"><td v-for="(cell, cellIndex) in row" :key="cellIndex">{{ cell }}</td></tr></tbody>
</table>
</div>
</template><script setup lang="ts">
import { ref } from 'vue';
import * as XLSX from 'xlsx';const sheetData = ref([]);const handleFileUpload = (event: Event) => {const file = (event.target as HTMLInputElement).files?.[0];if (file) {const reader = new FileReader();reader.onload = (e) => {const data = new Uint8Array(e.target?.result as ArrayBuffer);const workbook = XLSX.read(data, { type: 'array' });const firstSheetName = workbook.SheetNames[0];const worksheet = workbook.Sheets[firstSheetName];sheetData.value = XLSX.utils.sheet_to_json(worksheet, { header: 1 });};reader.readAsArrayBuffer(file);}
};
</script>

如果excel文件是后台返回的一个链接，需要重新请求解析成ArrayBuffer，
以下是nuxt3 示例：

// 为了解决跨域问题，在server/api 下 创建一个请求api， downloadFileByProxy.ts
import { defineEventHandler } from 'h3';export default defineEventHandler(async event => {const { filePath } =  getQuery(event);let matches = filePath?.match(/^https?\:\/\/([^\/?#]+)(?:[\/?#]|$)/i);let domain = matches && matches[1]; return proxyRequest(event,`https://${domain}/`, {fetch: ()=>fetch(filePath),})
})

在ExcelPreview.vue 文件中：

  async function getFile(path: string) {// download pdf from api to prevent CORSconst { _data } = await $fetch.raw(`/api/downloadFileByProxy`, {method: 'get',params: {filePath: path,},});let blob = _data;let buffer = await blob?.arrayBuffer();return buffer;}const debounceRenderHandle = debounce(async () => {bufferCache.value = bufferCache.value || (await getFile(props.path)); // bufferCache这里是用来处理缓存，可以视具体情况加这个变量与否const data = new Uint8Array(bufferCache.value as ArrayBuffer);const workbook = XLSX.read(data, { type: 'array' });const firstSheetName = workbook.SheetNames[0];const worksheet = workbook.Sheets[firstSheetName];sheetData.value = XLSX.utils.sheet_to_json(worksheet, { header: 1 });}, 500);