这一版本优化了很多

node_modules/wot-design-uni/components/composables/useLockScroll.ts

@@ -0,0 +1,37 @@
+import { onBeforeUnmount, onDeactivated, ref, watch } from 'vue'
+
+export function useLockScroll(shouldLock: () => boolean) {
+  const scrollLockCount = ref(0)
+
+  const lock = () => {
+    if (scrollLockCount.value === 0) {
+      document.getElementsByTagName('body')[0].style.overflow = 'hidden'
+    }
+    scrollLockCount.value++
+  }
+
+  const unlock = () => {
+    if (scrollLockCount.value > 0) {
+      scrollLockCount.value--
+      if (scrollLockCount.value === 0) {
+        document.getElementsByTagName('body')[0].style.overflow = ''
+      }
+    }
+  }
+
+  const destroy = () => {
+    shouldLock() && unlock()
+  }
+
+  watch(shouldLock, (value) => {
+    value ? lock() : unlock()
+  })
+
+  onDeactivated(destroy)
+  onBeforeUnmount(destroy)
+
+  return {
+    lock,
+    unlock
+  }
+}