Update canvas.js

canvas.js

@@ -81,7 +81,7 @@ app.post('/upload', upload.single('file'), async (req, res) => {
     ctx.fillStyle = '#FFFFFF';
     ctx.fillRect(0, 0, width, height);
     ctx.fillStyle = '#000000';
-    ctx.font = '20px Microsoft YaHei';
+    ctx.font = '20px WenQuanYi Zen Hei';
 
     const text = `
       File Name: ${fileName}