diff --git a/src/components/CodemirrorEditor/EditorHeader/PostInfo.vue b/src/components/CodemirrorEditor/EditorHeader/PostInfo.vue
index 51a6232..860a24b 100644
--- a/src/components/CodemirrorEditor/EditorHeader/PostInfo.vue
+++ b/src/components/CodemirrorEditor/EditorHeader/PostInfo.vue
@@ -1,12 +1,13 @@
 <script setup lang="ts">
 import { useStore } from '@/stores'
 import { Info } from 'lucide-vue-next'
+import { Primitive } from 'radix-vue'
 
 const store = useStore()
 const { output } = storeToRefs(store)
 
 const dialogVisible = ref(false)
-
+const extensionInstalled = ref(false)
 const form = ref<any>({
   title: ``,
   desc: ``,
@@ -40,12 +41,12 @@ function prePost() {
 declare global {
   interface Window {
     syncPost: (data: { thumb: string, title: string, desc: string, content: string }) => void
+    $syncer: any
   }
 }
 
 function post() {
   dialogVisible.value = false;
-  // 使用 window.$syncer 可以检测是否安装插件
   (window.syncPost)({
     thumb: form.value.thumb || form.value.auto.thumb,
     title: form.value.title || form.value.auto.title,
@@ -59,6 +60,10 @@ function onUpdate(val: boolean) {
     dialogVisible.value = false
   }
 }
+
+onMounted(() => {
+  extensionInstalled.value = window.$syncer !== `undefined`
+})
 </script>
 
 <template>
@@ -80,6 +85,23 @@ function onUpdate(val: boolean) {
         </AlertDescription>
       </Alert>
 
+      <Alert v-if="!extensionInstalled">
+        <Info class="h-4 w-4" />
+        <AlertTitle>未检测到插件</AlertTitle>
+        <AlertDescription>
+          请安装
+          <Primitive
+            as="a"
+            class="text-blue-500"
+            href="https://www.wechatsync.com/?utm_source=syncicon#install"
+            target="_blank"
+          >
+            文章同步助手
+          </Primitive>
+          插件
+        </AlertDescription>
+      </Alert>
+
       <div class="w-full flex items-center gap-4">
         <Label for="thumb" class="w-10 text-end">
           封面
diff --git a/src/components/CodemirrorEditor/EditorHeader/index.vue b/src/components/CodemirrorEditor/EditorHeader/index.vue
index d523e45..793cb28 100644
--- a/src/components/CodemirrorEditor/EditorHeader/index.vue
+++ b/src/components/CodemirrorEditor/EditorHeader/index.vue
@@ -8,7 +8,7 @@ import {
 } from '@/config'
 import { useStore } from '@/stores'
 import { addPrefix, processClipboardContent } from '@/utils'
-import { ChevronDownIcon, PanelLeftClose, PanelLeftOpen, Settings } from 'lucide-vue-next'
+import { ChevronDownIcon, Moon, PanelLeftClose, PanelLeftOpen, Settings, Sun } from 'lucide-vue-next'
 
 const emit = defineEmits([`addFormat`, `formatContent`, `startCopy`, `endCopy`])
 
@@ -155,6 +155,11 @@ function copy() {
         </Tooltip>
       </TooltipProvider>
 
+      <Button variant="outline" @click="toggleDark()">
+        <Moon v-show="isDark" class="size-4" />
+        <Sun v-show="!isDark" class="size-4" />
+      </Button>
+
       <div class="space-x-1 bg-background text-background-foreground mx-2 flex items-center border rounded-md">
         <Button variant="ghost" class="shadow-none" @click="copy">
           复制
diff --git a/src/components/ui/back-top/BackTop.vue b/src/components/ui/back-top/BackTop.vue
new file mode 100644
index 0000000..1284814
--- /dev/null
+++ b/src/components/ui/back-top/BackTop.vue
@@ -0,0 +1,61 @@
+<script setup lang="ts">
+import { throttle } from 'es-toolkit'
+import { ArrowUpFromLine } from 'lucide-vue-next'
+
+type Target = HTMLElement | Window | null
+
+const props = defineProps<{
+  left?: number
+  top?: number
+  right?: number
+  bottom?: number
+  visibilityHeight?: number
+  target?: string
+  onClick?: (e: MouseEvent) => void
+}>()
+
+const visibilityHeight = ref(props.visibilityHeight ?? 400)
+const visible = ref(false)
+
+const target = ref<Target>(null)
+
+function scrollToTop(e: MouseEvent) {
+  console.log(`scrollToTop`)
+  target.value?.scrollTo({ top: 0, left: 0, behavior: `smooth` })
+  props.onClick?.(e)
+}
+
+const throttledScroll = throttle((el: Target) => {
+  if (el instanceof HTMLElement) {
+    visible.value = el.scrollTop > visibilityHeight.value
+  }
+  else {
+    visible.value = window.scrollY > visibilityHeight.value
+  }
+}, 200, { edges: [`leading`, `trailing`] })
+
+onMounted(() => {
+  if (props.target) {
+    target.value = document.getElementById(props.target)
+  }
+  else {
+    target.value = window
+  }
+
+  target.value!.addEventListener(`scroll`, () => {
+    throttledScroll(target.value)
+  })
+})
+
+onUnmounted(() => {
+  target.value!.removeEventListener(`scroll`, () => {
+    throttledScroll(target.value)
+  })
+})
+</script>
+
+<template>
+  <Button v-if="visible" variant="outline" size="icon" class="fixed z-50 rounded-full" :style="{ left: `${left}px`, top: `${top}px`, right: `${right}px`, bottom: `${bottom}px` }" @click="scrollToTop">
+    <ArrowUpFromLine />
+  </Button>
+</template>
diff --git a/src/components/ui/back-top/index.ts b/src/components/ui/back-top/index.ts
new file mode 100644
index 0000000..5e6b7a0
--- /dev/null
+++ b/src/components/ui/back-top/index.ts
@@ -0,0 +1 @@
+export { default as BackTop } from './BackTop.vue'
diff --git a/src/views/CodemirrorEditor.vue b/src/views/CodemirrorEditor.vue
index 7e16d81..3663f4b 100644
--- a/src/views/CodemirrorEditor.vue
+++ b/src/views/CodemirrorEditor.vue
@@ -430,6 +430,8 @@ onMounted(() => {
               </div>
             </div>
           </div>
+
+          <BackTop target="preview" :right="40" :bottom="40" />
         </div>
         <CssEditor class="order-2 flex-1" />
         <RightSlider class="order-2" />