diff --git a/src/renderer/src/AixPPTist/src/views/Screen/BaseView.vue b/src/renderer/src/AixPPTist/src/views/Screen/BaseView.vue
index df33b5c..4b747bd 100644
--- a/src/renderer/src/AixPPTist/src/views/Screen/BaseView.vue
+++ b/src/renderer/src/AixPPTist/src/views/Screen/BaseView.vue
@@ -104,6 +104,7 @@ const {
   execPrev,
   execNext,
   animationIndex,
+  turning,
 } = useExecPlay()
 const { slideWidth, slideHeight } = useSlideSize()
 const { exitScreening } = useScreening()
diff --git a/src/renderer/src/AixPPTist/src/views/Screen/hooks/useExecPlay.ts b/src/renderer/src/AixPPTist/src/views/Screen/hooks/useExecPlay.ts
index cb59465..abccbfd 100644
--- a/src/renderer/src/AixPPTist/src/views/Screen/hooks/useExecPlay.ts
+++ b/src/renderer/src/AixPPTist/src/views/Screen/hooks/useExecPlay.ts
@@ -28,53 +28,56 @@ export default (isLoader?: boolean = true) => {
 
   // 执行元素动画 isAsync 为 true 时，异步执行，否则同步执行
   const runAnimation = (isAsync: boolean) => {
-    // 正在执行动画时，禁止其他新的动画开始
-    if (inAnimation.value && !isAsync) return
+    return new Promise((resolve, reject) => {
+      // 正在执行动画时，禁止其他新的动画开始
+      if (inAnimation.value && !isAsync) return resolve()
 
-    const { animations, autoNext } = formatedAnimations.value[animationIndex.value]
-    animationIndex.value += 1
+      const { animations, autoNext } = formatedAnimations.value[animationIndex.value]
+      animationIndex.value += 1
 
-    // 标记开始执行动画
-    inAnimation.value = true
+      // 标记开始执行动画
+      inAnimation.value = true
 
-    let endAnimationCount = 0
+      let endAnimationCount = 0
 
-    // 依次执行该位置中的全部动画
-    for (const animation of animations) {
-      const elRef: HTMLElement | null = document.querySelector(`#screen-element-${animation.elId} [class^=base-element-]`)
-      if (!elRef) {
-        endAnimationCount += 1
-        continue
-      }
-
-      const animationName = `${ANIMATION_CLASS_PREFIX}${animation.effect}`
-      
-      // 执行动画前先清除原有的动画状态（如果有）
-      elRef.style.removeProperty('--animate-duration')
-      for (const classname of elRef.classList) {
-        if (classname.indexOf(ANIMATION_CLASS_PREFIX) !== -1) elRef.classList.remove(classname, `${ANIMATION_CLASS_PREFIX}animated`)
-      }
-      
-      // 执行动画
-      elRef.style.setProperty('--animate-duration', `${animation.duration}ms`)
-      elRef.classList.add(animationName, `${ANIMATION_CLASS_PREFIX}animated`)
-
-      // 执行动画结束，将“退场”以外的动画状态清除
-      const handleAnimationEnd = () => {
-        if (animation.type !== 'out') {
-          elRef.style.removeProperty('--animate-duration')
-          elRef.classList.remove(animationName, `${ANIMATION_CLASS_PREFIX}animated`)
+      // 依次执行该位置中的全部动画
+      for (const animation of animations) {
+        const elRef: HTMLElement | null = document.querySelector(`#screen-element-${animation.elId} [class^=base-element-]`)
+        if (!elRef) {
+          endAnimationCount += 1
+          continue
         }
 
-        // 判断该位置上的全部动画都已经结束后，标记动画执行完成，并尝试继续向下执行（如果有需要）
-        endAnimationCount += 1
-        if (endAnimationCount === animations.length) {
-          inAnimation.value = false
-          if (autoNext) runAnimation()
+        const animationName = `${ANIMATION_CLASS_PREFIX}${animation.effect}`
+        
+        // 执行动画前先清除原有的动画状态（如果有）
+        elRef.style.removeProperty('--animate-duration')
+        for (const classname of elRef.classList) {
+          if (classname.indexOf(ANIMATION_CLASS_PREFIX) !== -1) elRef.classList.remove(classname, `${ANIMATION_CLASS_PREFIX}animated`)
         }
+        
+        // 执行动画
+        elRef.style.setProperty('--animate-duration', `${animation.duration}ms`)
+        elRef.classList.add(animationName, `${ANIMATION_CLASS_PREFIX}animated`)
+
+        // 执行动画结束，将“退场”以外的动画状态清除
+        const handleAnimationEnd = async() => {
+          if (animation.type !== 'out') {
+            elRef.style.removeProperty('--animate-duration')
+            elRef.classList.remove(animationName, `${ANIMATION_CLASS_PREFIX}animated`)
+          }
+
+          // 判断该位置上的全部动画都已经结束后，标记动画执行完成，并尝试继续向下执行（如果有需要）
+          endAnimationCount += 1
+          if (endAnimationCount === animations.length) {
+            inAnimation.value = false
+            if (autoNext) await runAnimation()
+            resolve() // 执行完成
+          }
+        }
+        elRef.addEventListener('animationend', handleAnimationEnd, { once: true })
       }
-      elRef.addEventListener('animationend', handleAnimationEnd, { once: true })
-    }
+    })
   }
   if (isLoader) { // 加载相关钩子
     onMounted(() => {
@@ -147,7 +150,7 @@ export default (isLoader?: boolean = true) => {
     }
     inAnimation.value = false
   }
-  const execNext = (isAsync: boolean) => {
+  const execNext = async(isAsync: boolean) => {
     if (formatedAnimations.value.length && animationIndex.value < formatedAnimations.value.length) {
       runAnimation(isAsync)
     }
@@ -216,9 +219,17 @@ export default (isLoader?: boolean = true) => {
   // 向上翻页/向下翻页
   const turning = async (e, type) => {
     e.preventDefault() // 阻止默认事件
-    if (type === 'prev') execPrev()
-    else if (type === 'next') execNext()
-    if (classcourseStore.classcourse) { // 上课中
+    window.scrollTo(0, 0) // 滚动到顶部
+    const isCourse = !!classcourseStore.classcourse
+    if (type === 'prev') {
+      if (!isCourse) execPrev() // 上一步
+      else { // 上课状态: 上一步 动作变成 上一页
+        const current = slideIndex.value
+        if (current <= 0) return throttleMassage('已经是第一页了')
+        turnSlideToIndex(current - 1) // 翻页: 上一页
+      }
+    } else if (type === 'next') execNext()
+    if (isCourse) { // 上课中
       const current = slideIndex.value
       const animationSteps = animationIndex.value
       const animation = type == 'next'?'Nextsteps':'Previoustep'
@@ -285,5 +296,6 @@ export default (isLoader?: boolean = true) => {
     execPrev,
     execNext,
     animationIndex,
+    turning,
   }
 }
diff --git a/src/renderer/src/views/prepare/container/class-start.vue b/src/renderer/src/views/prepare/container/class-start.vue
index 6795990..a9b602a 100644
--- a/src/renderer/src/views/prepare/container/class-start.vue
+++ b/src/renderer/src/views/prepare/container/class-start.vue
@@ -364,8 +364,12 @@ const openPublicScreen = (classcourse, isPublic) => {
   console.log('打开公屏', classcourse)
   if (!dt.ctCourse) { // 新开课需要发送消息-继续上课不需要直接打开
     // 发送app端待开课消息
-    const data = { id: classcourse.id }
-    ChatWs.sendMsg(MsgEnum.HEADS.MSG_0000, data, {}, ChatWs.TYPES.single, userStore.id)
+    const TeacherId = userStore.id
+    const data = { id: classcourse.id, TeacherId }
+    const head = isPublic ? MsgEnum.HEADS.MSG_open : MsgEnum.HEADS.MSG_0000 // 消息头
+    const type = isPublic ? ChatWs.TYPES.group : ChatWs.TYPES.single // 消息类型
+    const toId = isPublic ? classcourse.timgroupid : TeacherId // 消息接收人
+    ChatWs.sendMsg(head, data, {}, type, toId)
   }
   // 缓存当前资源信息
   const resource = toRaw(myClassActive.value)