优化首尾跳转的响应逻辑，当方向键一直按住的时候不触发跳转直到再点一次

src/components/VirtualList.vue

@@ -191,6 +191,10 @@ const lastReachBoundaryTime = ref<{ top: number; bottom: number }>({
   bottom: 0
 })
 
+// 添加新的状态变量用于追踪按键状<E994AE><E78AB6><EFBFBD>
+const isKeyPressed = ref<boolean>(false)
+let keyPressTimer: number | null = null
+
 /**
  * 处理键盘事件
  * 实现键盘导航、边界循环和项目选择功能
@@ -204,13 +208,25 @@ function handleKeyDown(e: KeyboardEvent): void {
       const item = props.data[selectedIndex.value]
       emit('click', { ...item, index: selectedIndex.value })
     }
-  } else if (e.key === 'ArrowUp' || e.key === 'ArrowDown') {
+    return
+  }
+  
+  if (e.key === 'ArrowUp' || e.key === 'ArrowDown') {
     e.preventDefault()
     
     const isFirstItem = selectedIndex.value === 0
     const isLastItem = selectedIndex.value === props.data.length - 1
     const now = Date.now()
     
+    // 只在首尾项时检查按键状态
+    if ((e.key === 'ArrowUp' && isFirstItem) || (e.key === 'ArrowDown' && isLastItem)) {
+      if (isKeyPressed.value) {
+        return
+      }
+      isKeyPressed.value = true
+      if (keyPressTimer) clearTimeout(keyPressTimer)
+    }
+    
     if (e.key === 'ArrowUp' && isFirstItem) {
       const timeSinceLastTop = now - lastReachBoundaryTime.value.top
       if (timeSinceLastTop < 5000) {
@@ -247,6 +263,7 @@ function handleKeyDown(e: KeyboardEvent): void {
       return
     }
     
+    // 非首尾项的正常导航逻辑
     isKeyboardNavigating.value = true
     if (keyboardTimer) clearTimeout(keyboardTimer)
     
@@ -277,6 +294,17 @@ function handleKeyDown(e: KeyboardEvent): void {
   }
 }
 
+// 添加键盘抬起事件处理函数
+function handleKeyUp(e: KeyboardEvent): void {
+  if (e.key === 'ArrowUp' || e.key === 'ArrowDown') {
+    // 设置一个短暂的延时，确保不会立即响应下一次按键
+    if (keyPressTimer) clearTimeout(keyPressTimer)
+    keyPressTimer = window.setTimeout(() => {
+      isKeyPressed.value = false
+    }, 50)
+  }
+}
+
 /**
  * 保持选中项在可视区域内
  * 如果选中项不可见，则滚动到合适位置
@@ -330,6 +358,7 @@ onMounted(() => {
   // 添加全局事件监听
   window.addEventListener('resize', updateContainerHeight)
   window.addEventListener('keydown', handleKeyDown)
+  window.addEventListener('keyup', handleKeyUp)
 })
 
 onBeforeUnmount(() => {
@@ -344,8 +373,10 @@ onBeforeUnmount(() => {
   
   window.removeEventListener('resize', updateContainerHeight)
   window.removeEventListener('keydown', handleKeyDown)
+  window.removeEventListener('keyup', handleKeyUp)
   if (keyboardTimer) clearTimeout(keyboardTimer)
   if (hoverTimer) clearTimeout(hoverTimer)
+  if (keyPressTimer) clearTimeout(keyPressTimer)
 })
 </script>