将dashboard和login以外的页面设置为异步加载，以提升初次加载的速度

src/api/calendar.ts

@@ -1,5 +1,9 @@
 import { service } from '../utils/request'
 
+const headers = {
+  'Content-Type': 'application/json;charsetset=UTF-8'
+}
+
 const put_event = (data: Object) => {
   return service({
     url: '/calendar/api/v1/event',
@@ -12,6 +16,7 @@ const get_event = () => {
   return service({
     url: '/calendar/api/v1/event',
     method: 'GET',
+    headers: headers
   })
 }