diff --git a/doc/api.md b/doc/api.md
index d6044f5..ed051c1 100644
--- a/doc/api.md
+++ b/doc/api.md
@@ -278,7 +278,7 @@
                 "maxCombo": 1,		// 当局连续答对的最大数量
                 "score": 10,			// 当前得分
                 "star": 1,			  // 当局胜利后获得的星星
-                "timeLeft": 1, 		// 当局剩余时间
+                "timeLeft": 1, 		// 当局使用时间
                 "gameResult": 0,		// 当局的游戏结果, 单人的话和上一层gameResult相同
                 "timeLast": 1620973155307	//上次回答时间
             }
diff --git a/src/api/controllers/exam.controller.ts b/src/api/controllers/exam.controller.ts
index 2f26fc6..163ccf3 100644
--- a/src/api/controllers/exam.controller.ts
+++ b/src/api/controllers/exam.controller.ts
@@ -113,6 +113,7 @@ class ExamController extends BaseController {
       statMap.errorCount++
       statMap.comboCount = 0
     }
+    statMap.timeLeft = (statMap.timeLast - history.createdAt.getTime()) / 1000
     history.status = 1
 
     let score = result ? calcExamScore(time, statMap.comboCount) : 0
diff --git a/src/services/Wechat.ts b/src/services/Wechat.ts
new file mode 100644
index 0000000..ef017dd
--- /dev/null
+++ b/src/services/Wechat.ts
@@ -0,0 +1,5 @@
+
+export async function generateQr({appId, appSecret, scene, filePath}) {
+
+}
+