导出png

src/views/learning/item-list.vue

@@ -882,11 +882,14 @@ export default {
           let imgWidth = 595.28;
           let imgHeight = 592.28 / contentWidth * contentHeight;
 
-          let pageData = canvas.toDataURL('image/jpeg', 1.0);
+          // let pageData = canvas.toDataURL('image/jpeg', 1.0);
+          let pageData = canvas.toDataURL('image/png');
 
           let pdf = new JsPDF('', 'pt', [contentWidth*0.8,contentHeight*0.8]);
           
-          pdf.addImage(pageData, 'JPEG', 0, position, contentWidth*0.8, contentHeight*0.8)
+          // pdf.addImage(pageData, 'JPEG', 0, position, contentWidth*0.8, contentHeight*0.8)
+          pdf.addImage(pageData, 'PNG', 0, position, contentWidth*0.8, contentHeight*0.8)
+
           let title = "导出学情报告";
           pdf.save(title + '.pdf');