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File Formats

DOCX

Office Open XML Document

Microsoft Word's default document format using XML files compressed in a ZIP archive.

技术细节

File docx reduces storage and transmission size. DEFLATE (used in ZIP and gzip) combines LZ77 dictionary coding with Huffman coding. Brotli (RFC 7932) achieves 15-25% better compression than gzip for text content and is supported by all modern browsers for HTTP compression. Zstandard (zstd) offers tunable compression levels from fast (comparable to lz4) to high (comparable to LZMA). For files already in compressed formats (JPEG, MP3, ZIP), re-compression provides negligible benefit and may slightly increase file size.

示例

```javascript
// Create ZIP archive in browser (using JSZip)
const zip = new JSZip();
zip.file('readme.txt', 'Hello World');
zip.file('data/report.csv', csvContent);

const blob = await zip.generateAsync({
  type: 'blob',
  compression: 'DEFLATE',
  compressionOptions: { level: 6 },
});
saveAs(blob, 'archive.zip');
```

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