118 lines
3.4 KiB
TypeScript
118 lines
3.4 KiB
TypeScript
import JSZip from 'jszip';
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import { saveAs } from 'file-saver';
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// 假设使用的是 Element Plus,请根据实际 UI 库调整导入
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import { ElMessage } from 'element-plus';
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/**
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* 图片数据接口
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*/
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interface ImageItem {
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name: string;
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url: string;
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}
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/**
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* 批量导出图片并生成 ZIP
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* @param imageList 图片数组
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* @param zipName 压缩包名称
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* @param concurrency 并发请求数,默认 5,避免浏览器请求过多被拦截
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*/
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export async function exportImagesToZip(imageList: ImageItem[], zipName: string = 'images', concurrency: number = 5) {
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if (!imageList || imageList.length === 0) {
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ElMessage.warning('没有可导出的图片');
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return;
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}
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const zip = new JSZip();
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try {
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// 使用并发控制处理图片获取
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const tasks = imageList.map((item) => () => processImageItem(item, zip));
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// 执行并发任务
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await runWithConcurrency(tasks, concurrency);
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ElMessage.success('导出完成');
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// 生成 ZIP 并下载
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const content = await zip.generateAsync({
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type: 'blob',
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compression: 'DEFLATE',
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compressionOptions: { level: 6 }
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});
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saveAs(content, `${zipName}.zip`);
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} catch (err) {
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console.error('ZIP 导出失败:', err);
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ElMessage.error('图片导出失败,请重试');
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}
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}
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/**
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* 处理单个图片项:获取 Blob 并添加到 Zip
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*/
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async function processImageItem(item: ImageItem, zip: JSZip): Promise<void> {
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try {
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// 清理文件名,防止非法字符或扩展名缺失
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const safeName = sanitizeFileName(item.name);
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const blob = await getImageBlobViaCanvas(item.url);
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zip.file(`${safeName}.png`, blob, { binary: true });
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} catch (error) {
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console.warn(`图片加载失败: ${item.url}`, error);
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throw error; // 抛出错误以便外层统计或处理
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}
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}
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/**
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* 通过 Canvas 获取图片 Blob (解决 OSS 跨域 fetch 问题)
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* 注意:这要求 OSS _bucket_ 配置了 CORS 允许 '*' 或你的域名,且允许 GET 方法。
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* 如果 OSS 完全禁止跨域,此方法也会失败,但通常公共读 OSS 是允许 img 标签跨域显示的。
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*/
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async function getImageBlobViaCanvas(url: string): Promise<Blob> {
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const response = await fetch(url);
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if (!response.ok) {
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throw new Error(`HTTP error! status: ${response.status}`);
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}
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return response.blob();
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}
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/**
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* 简单的并发控制执行器
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*/
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async function runWithConcurrency(tasks: (() => Promise<void>)[], limit: number): Promise<void> {
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const results: Promise<void>[] = [];
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let index = 0;
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async function worker() {
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while (index < tasks.length) {
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const currentIndex = index++;
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const task = tasks[currentIndex];
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try {
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await task();
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} catch (e) {
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// 这里可以选择忽略单个失败,或者累计错误
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console.error(`Task ${currentIndex} failed`, e);
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}
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}
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}
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// 创建 limit 个工人
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const workers = Array(Math.min(limit, tasks.length)).fill(null).map(worker);
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await Promise.all(workers);
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}
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/**
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* 清理文件名,确保合法且唯一(简单版)
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*/
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function sanitizeFileName(name: string): string {
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// 移除非法字符,保留字母、数字、中文、下划线、点、横杠
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let cleanName = name.replace(/[<>:"/\\|?*]/g, '_');
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// 如果名字为空或只有扩展名,给一个默认名
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if (!cleanName || cleanName.startsWith('.')) {
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cleanName = `image_${Date.now()}_${Math.random().toString(36).substr(2, 9)}${cleanName}`;
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}
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return cleanName;
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}
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