feat：移动端连续弹框引起的滚动问题

app/hooks/useBodyScrollLock.js

@@ -1,18 +1,60 @@
-import { useEffect } from "react";
+import { useEffect, useRef } from "react";
 
-export function useBodyScrollLock(open) {
-  useEffect(() => {
-    if (!open) return;
+// 全局状态：支持多个弹框“引用计数”式地共用一个滚动锁
+let scrollLockCount = 0;
+let lockedScrollY = 0;
+let originalBodyPosition = "";
+let originalBodyTop = "";
 
-    const scrollY = window.scrollY;
+function lockBodyScroll() {
+  scrollLockCount += 1;
+
+  // 只有第一个锁才真正修改 body，避免多弹框互相干扰
+  if (scrollLockCount === 1) {
+    lockedScrollY = window.scrollY || window.pageYOffset || 0;
+    originalBodyPosition = document.body.style.position || "";
+    originalBodyTop = document.body.style.top || "";
 
     document.body.style.position = "fixed";
-    document.body.style.top = `-${scrollY}px`;
+    document.body.style.top = `-${lockedScrollY}px`;
+    document.body.style.width = "100%";
+  }
+}
 
+function unlockBodyScroll() {
+  if (scrollLockCount === 0) return;
+
+  scrollLockCount -= 1;
+
+  // 只有全部弹框都关闭时才恢复滚动位置
+  if (scrollLockCount === 0) {
+    document.body.style.position = originalBodyPosition;
+    document.body.style.top = originalBodyTop;
+    document.body.style.width = "";
+
+    // 恢复到锁定前的滚动位置，而不是跳到顶部
+    window.scrollTo(0, lockedScrollY);
+  }
+}
+
+export function useBodyScrollLock(open) {
+  const isLockedRef = useRef(false);
+
+  useEffect(() => {
+    if (open && !isLockedRef.current) {
+      lockBodyScroll();
+      isLockedRef.current = true;
+    } else if (!open && isLockedRef.current) {
+      unlockBodyScroll();
+      isLockedRef.current = false;
+    }
+
+    // 组件卸载或依赖变化时兜底释放锁
     return () => {
-      document.body.style.position = "";
-      document.body.style.top = "";
-      window.scrollTo(0, scrollY);
+      if (isLockedRef.current) {
+        unlockBodyScroll();
+        isLockedRef.current = false;
+      }
     };
   }, [open]);
 }