case 'top-left': x = padding; y = padding + fontSize; break; } // 绘制品牌和型号 ctx.strokeText(brandText, x, y); ctx.fillText(brandText, x, y); // 绘制详细信息 ctx.font = `${fontSize * 0.8}px Arial`; ctx.strokeText(infoText, x, y + fontSize); ctx.fillText(infoText, x, y + fontSize); ctx.restore(); } } // 导出图片 const format = document.getElementById('exportFormat').value; const quality = document.getElementById('qualityRange').value / 100; let mimeType = 'image/jpeg'; let fileName = 'watermarked_image.jpg'; if (format === 'png') { mimeType = 'image/png'; fileName = 'watermarked_image.png'; } else if (format === 'webp') { mimeType = 'image/webp'; fileName = 'watermarked_image.webp'; } canvas.toBlob((blob) => { const url = URL.createObjectURL(blob); const a = document.createElement('a'); a.href = url; a.download = fileName