feat: add share feature to the homepage and topic detail page

Author: Lsnsh

src/pages/index/index.js

@@ -55,6 +55,12 @@ Page({
     // 追加主题列表数据
     this.fnNetRTopicList(1);
   },
+  onShareAppMessage() {
+    return {
+      title: 'CNode 社区第三方版',
+      path: '/pages/index/index'
+    };
+  },
   // 切换tab选项卡
   fnTapSwitchTab(e) {
     let oDataSet = e.currentTarget.dataset;

src/pages/topic/topic.js

@@ -24,6 +24,12 @@ Page({
     this.fnFetchTopicDetail(this.data.sTopicId);
   },
   onReachBottom() {},
+  onShareAppMessage() {
+    return {
+      title: this.data.oTopicDetail.title,
+      path: `/pages/topic/topic?id=${this.data.sTopicId}`
+    };
+  },
   // 切换主题收藏状态
   fnTapSwitchTopicCollectStatus() {
     // 先检查用户登录状态