diff --git a/pages/topics/index.js b/pages/topics/index.js
index d93368a..f5cef5d 100644
--- a/pages/topics/index.js
+++ b/pages/topics/index.js
@@ -66,8 +66,9 @@ Page({
 
   // 定义点击标题的事件处理函数，将选中标题的id赋值给selectedTitle
   tapSegment: function (e) {
+    const item = e.detail;
     this.setData({
-      selectedTitle: e.detail 
+      selectedTitle: item.index 
     });
   }
 })
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