修复线上切换时的bug

public/html/font/index.css

@@ -1,15 +1,15 @@
 @font-face {
   font-family: 'PingFang Bold';
-  src: url('./PingFang Bold.ttf');
+  src: url('./PingFang Bold.ttf') format('truetype');
 }
 .PingFang_Bold {
-  font-family: 'PingFang Bold';
+  font-family: 'PingFang Bold' , sans-serif;
 }
 
 @font-face {
   font-family: 'PingFang Medium';
-  src: url('./PingFang Medium.ttf');
+  src: url('./PingFang Medium.ttf') format('truetype');
 }
 .PingFang_Medium {
-  font-family: 'PingFang Medium';
+  font-family: 'PingFang Medium' , sans-serif;
 }