File System Access 保存类型与 MIME 映射实践

概述保存对话框支持类型列表与建议文件名。本文给出类型与 MIME 映射的标准用法。类型映射与保存const types = [ { description: '文本文件', accept: { 'text/plain': ['.txt'] } }, { description: 'JSON 文件', accept: { 'application/json': ['.json'] } } ]; async function saveText(name, text, mime = 'text/plain') { const handle = await window.showSaveFilePicker({ suggestedName: name, types }); const ws = await handle.createWritable(); const blob = new Blob([text], { type: mime }); await ws.write(blob); await ws.close(); }