优化pdf显示问题

components/pdf-viewer/pdf-viewer.vue

@@ -470,7 +470,12 @@ const loadPdfPage = async (pageNumber: number) => {
     }
     }
     
     
     const page = await pdfDoc.value.getPage(pageNumber);
     const page = await pdfDoc.value.getPage(pageNumber);
-    const viewport = page.getViewport({ scale: 1.8 });
+	// 根据设备像素比动态设置缩放
+	const pixelRatio = window.devicePixelRatio || 1;
+	const scale = Math.max(1.5, pixelRatio); // 至少 1.5 倍，高分屏自动更高
+	
+	const viewport = page.getViewport({ scale });
+    // const viewport = page.getViewport({ scale: 1.8 });
     
     
     const canvas = document.createElement('canvas');
     const canvas = document.createElement('canvas');
     const context = canvas.getContext('2d');
     const context = canvas.getContext('2d');