perf(directory): changelog page optimization

directory/src/routes/path/changelogs.jsx

@@ -1,9 +1,11 @@
 import {
   useState,
   useEffect,
+  useMemo
 } from 'react'
 import './changelogs.css'
 import { useHeader } from '@/state/header';
+import { useAppbar } from '@/state/appbar';
 import useUmami from '@parcellab/react-use-umami'
 import MainBorder from '@/component/main_border';
 
@@ -15,10 +17,14 @@ export default function Changelogs(props) {
     currentTab,
     setHeaderIcon,
   } = useHeader()
+  const {
+    setExtraArea,
+  } = useAppbar()
   const [changelogs, setChangelogs] = useState([])
 
   useEffect(() => {
     setTitle('changelogs')
+    setExtraArea([])
     setHeaderIcon(null)
     fetch('/_assets/changelogs.json').then(res => res.json()).then(data => {
       setChangelogs(data)
@@ -33,33 +39,37 @@ export default function Changelogs(props) {
     }))
   }, [changelogs])
 
+  const content = useMemo(() => {
+    return (
+      changelogs.map((v) => {
+        return (
+          v.map((item) => {
+            return (
+              <section className="item-group-wrapper" key={item.date} hidden={currentTab !== item.key}>
+                <section className="item-group">
+                  <section className="item-info">
+                    {item.content.map((entry, index) => {
+                      return (
+                        <section className="item-info-content" key={index}>
+                          {entry}
+                        </section>
+                      )
+                    })}
+                  </section>
+                  <section className='item-group-date'>{item.date}</section>
+                </section>
+                <MainBorder />
+              </section>
+            )
+          })
+        )
+      })
+    )
+  }, [changelogs, currentTab])
+
   return (
     <section className="changelogs">
-      {
-        changelogs.map((v) => {
-          return (
-            v.map((item) => {
-              return (
-                <section className="item-group-wrapper" key={item.date} hidden={currentTab !== item.key}>
-                  <section className="item-group">
-                    <section className="item-info">
-                      {item.content.map((entry, index) => {
-                        return (
-                          <section className="item-info-content" key={index}>
-                            {entry}
-                          </section>
-                        )
-                      })}
-                    </section>
-                    <section className='item-group-date'>{item.date}</section>
-                  </section>
-                  <MainBorder />
-                </section>
-              )
-            })
-          )
-        })
-      }
+      {content}
     </section>
   )
 }