diff --git a/laf-cloud/functions/userData.ts b/laf-cloud/functions/userData.ts
index c0e75f5..65d6ede 100644
--- a/laf-cloud/functions/userData.ts
+++ b/laf-cloud/functions/userData.ts
@@ -46,7 +46,8 @@ export default async function (ctx: FunctionContext) {
       }
       //console.log(data);
       let res2 = await db.collection(dbname).where({ _id: uid }).update(data);
-      if (res2.ok && res2.updated == 1) {
+      // 同值保存不会增加 updated；匹配到用户且操作成功也属于保存成功。
+      if (res2.ok && (res2.updated == 1 || res2.matched == 1)) {
         return { code: 1, data: null, msg: "用户数据更新成功" }
       } else {
         return { code: 0, data: null, msg: "用户数据更新失败" }
diff --git a/laf-cloud/tests/user-data-save.test.mjs b/laf-cloud/tests/user-data-save.test.mjs
new file mode 100644
index 0000000..b68021f
--- /dev/null
+++ b/laf-cloud/tests/user-data-save.test.mjs
@@ -0,0 +1,120 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { registerHooks } from "node:module";
+
+const state = { user: null, failUpdate: false, loseMatch: false, legacyResult: false, results: [] };
+const profile = { useravatar: "2", username: "player", useravatarIcon: "1", userCat: "3" };
+
+globalThis.__userDataSaveCloudMock = {
+  database() {
+    return {
+      collection() {
+        return {
+          where(query) {
+            return {
+              async getOne() {
+                return { data: state.user?._id === query._id ? structuredClone(state.user) : null };
+              },
+              async update(payload) {
+                if (state.loseMatch) state.user = null;
+                const matched = state.user?._id === query._id ? 1 : 0;
+                const updated = !state.failUpdate && matched
+                  && Object.entries(payload).some(([key, value]) => state.user[key] !== value) ? 1 : 0;
+                if (updated) Object.assign(state.user, payload);
+                const result = { ok: !state.failUpdate, updated, ...(!state.legacyResult ? { matched } : {}) };
+                state.results.push(result);
+                return result;
+              },
+            };
+          },
+        };
+      },
+    };
+  },
+};
+globalThis.__userDataSaveUtilsMock = {
+  checkToken(received, expected) { return received === expected; },
+};
+
+registerHooks({
+  resolve(specifier, context, nextResolve) {
+    if (specifier === "@lafjs/cloud") {
+      return { url: "data:text/javascript,export default globalThis.__userDataSaveCloudMock", shortCircuit: true };
+    }
+    if (specifier === "@/Utils") {
+      return { url: "data:text/javascript,export default globalThis.__userDataSaveUtilsMock", shortCircuit: true };
+    }
+    return nextResolve(specifier, context);
+  },
+});
+
+const { default: userData } = await import(new URL("../functions/userData.ts", import.meta.url));
+
+function reset() {
+  state.user = { _id: "user-1", token: "token-1", useravatar: "0", username: "user", useravatarIcon: "0", userCat: "1" };
+  state.failUpdate = false;
+  state.loseMatch = false;
+  state.legacyResult = false;
+  state.results = [];
+}
+
+function save(extra = {}) {
+  return userData({ body: {
+    uid: "user-1", token: "token-1", action: "save", userData: JSON.stringify(profile), ...extra,
+  } });
+}
+
+test("saving changed and then identical profile data both succeeds", async () => {
+  reset();
+  const first = await save();
+  const repeated = await save();
+  assert.deepEqual(state.results, [
+    { ok: true, matched: 1, updated: 1 },
+    { ok: true, matched: 1, updated: 0 },
+  ]);
+  assert.equal(first.code, 1);
+  assert.equal(repeated.code, 1);
+  assert.deepEqual(state.user, { _id: "user-1", token: "token-1", ...profile });
+});
+
+test("a missing uid is rejected without updating", async () => {
+  reset();
+  assert.equal((await save({ uid: undefined })).code, 0);
+  assert.equal(state.results.length, 0);
+});
+
+test("an unknown user is not mistaken for an unchanged successful save", async () => {
+  reset();
+  const before = structuredClone(state.user);
+  assert.equal((await save({ uid: "missing-user" })).code, 0);
+  assert.deepEqual(state.user, before);
+});
+
+test("losing the matching user during the update remains a failure", async () => {
+  reset();
+  state.loseMatch = true;
+  assert.equal((await save()).code, 0);
+  assert.deepEqual(state.results, [{ ok: true, matched: 0, updated: 0 }]);
+});
+
+test("an explicitly failed database update remains a failure", async () => {
+  reset();
+  state.failUpdate = true;
+  const before = structuredClone(state.user);
+  assert.equal((await save()).code, 0);
+  assert.deepEqual(state.results, [{ ok: false, matched: 1, updated: 0 }]);
+  assert.deepEqual(state.user, before);
+});
+
+test("an invalid token prevents all writes", async () => {
+  reset();
+  assert.equal((await save({ token: "wrong-token" })).code, 0);
+  assert.equal(state.results.length, 0);
+});
+
+test("legacy update results with only ok and updated still succeed", async () => {
+  reset();
+  state.legacyResult = true;
+  assert.equal((await save()).code, 1);
+  assert.deepEqual(state.results, [{ ok: true, updated: 1 }]);
+});