refactor(YooForum): change `getTopicList` function

src/component/YooForum.js

@@ -14,6 +14,7 @@ export default class YooForum extends Component {
     this.state = {
       hint: '准备中',
       topics: [],
+      fetchedListPage: 0,
     };
     this.initForum = this.initForum.bind(this);
     this.getTopicList = this.getTopicList.bind(this);
@@ -87,9 +88,7 @@ export default class YooForum extends Component {
                       'http://eol.ctbu.edu.cn/meol/jpk/course/layout/newpage/index.jsp?courseId=46445',
                   },
                 )
-                  .then(() => {
-                    this.getTopicList();
-                  })
+                  .then(this.getTopicList)
                   .catch(ShowErrorToast);
               })
               .catch(ShowErrorToast);
@@ -101,7 +100,8 @@ export default class YooForum extends Component {
       .catch(ShowErrorToast);
   }
 
-  getTopicList(page = 1) {
+  getTopicList() {
+    const page = this.state.fetchedListPage + 1;
     this.setState({hint: '获取数据中'});
     gbkFetch(
       'GET',
@@ -128,7 +128,11 @@ export default class YooForum extends Component {
           current.next().text(),
         );
       });
-      this.setState({topics: [...this.state.topics, ...newTopics], hint: ''});
+      this.setState({
+        topics: [...this.state.topics, ...newTopics],
+        hint: '',
+        fetchedListPage: page,
+      });
     });
   }