群解散时，无论在群组中的哪个页面，都退回到会话列表页面

pages/im/group/announcement.vue

@@ -35,8 +35,12 @@
         deleteGroupAnnouncement,
         topGroupAnnouncement
     } from '@/apis/interfaces/im.js'
+    import onGroupDismiss from '@/utils/im/onGroupDismiss.js'
 
     export default {
+        mixins: [
+            onGroupDismiss
+        ],
         data() {
             return {
                 targetId: '',
@@ -54,8 +58,8 @@
                     name: '置顶该公告',
                     disabled: false
                 }],
-                actionTitle: '请选择操作',
-                bg:'#fff'
+                actionTitle: '请选择操作',
+                bg: '#fff'
             }
         },
         onLoad(e) {
@@ -84,11 +88,11 @@
         methods: {
             // 获取公告信息
             initData() {
-                getGroupAnnouncements(this.targetId).then(res => {
-                    if(res.length>0){
-                        this.bg = '#f9f9f9'
-                    }else{
-                        this.bg = '#fff'
+                getGroupAnnouncements(this.targetId).then(res => {
+                    if (res.length > 0) {
+                        this.bg = '#f9f9f9'
+                    } else {
+                        this.bg = '#fff'
                     }
                     this.announcements = res
                     this.loading = false
@@ -183,8 +187,8 @@
         .item {
             background-color: #fff;
             padding: $padding $padding + 10 10rpx $padding + 10;
-            border-bottom: $padding solid #f9f9f9;
-            
+            border-bottom: $padding solid #f9f9f9;
+
 
             .user {
                 display: flex;
@@ -193,7 +197,7 @@
                 align-items: center;
                 box-sizing: border-box;
                 font-size: $title-size-m;
-                color: $text-gray-m;
+                color: $text-gray-m;
                 padding: 10rpx;
 
                 .name {
@@ -214,8 +218,8 @@
                 -webkit-box-orient: vertical;
                 -webkit-line-clamp: 3;
                 overflow: hidden;
-                line-height: 1.5;
-                border-bottom: solid 1rpx  #F9F9F9;
+                line-height: 1.5;
+                border-bottom: solid 1rpx #F9F9F9;
                 padding-bottom: 20rpx;
 
                 span {