fix: mobile我的文库保存滚动高度优化

jydocs-mobile/src/views/user/Library.vue

@@ -5,6 +5,7 @@
       :title-inactive-color="tabConf.titleInactiveColor"
       :line-width="tabConf.lineWidth"
       :color="tabConf.color"
+      :before-change="beforeTabChange"
       v-model="tabActive"
       class="j-container"
     >
@@ -55,13 +56,13 @@
             />
           </div>
         </van-list>
-        <Empty v-if="myLibListState.list.length === 0 && myCollectionListState.loaded">暂无数据</Empty>
+        <Empty v-if="myCollectionListState.list.length === 0 && myCollectionListState.loaded">暂无数据</Empty>
       </van-tab>
     </van-tabs>
   </div>
 </template>
 <script lang="ts">
-import { Component, Vue } from 'vue-property-decorator'
+import { Component, Vue, Watch } from 'vue-property-decorator'
 import { Tabs, Tab, List } from 'vant'
 import { mapState, mapMutations, mapActions } from 'vuex'
 import Card from '@/components/docs-card/Card.vue'
@@ -139,11 +140,22 @@ export default class UserLibrary extends Vue {
     return map[this.tabActive] || map[0]
   }
 
+  @Watch('tabActive')
+  onTabChange () {
+    const i: any = this.$data[this.keyForList]
+    this.setScrollTop(i.scrollTop)
+  }
+
   created () {
     this.tabActive = this.$route.query.tab as string
     this.reStoreState()
   }
 
+  beforeTabChange () {
+    this.saveScrollTop()
+    return true
+  }
+
   toDocDetail (item: any) {
     const { docId: id } = item
     this.saveState()
@@ -188,7 +200,6 @@ export default class UserLibrary extends Vue {
   }
 
   reStoreState () {
-    console.log('reStoreState')
     const listInfo = this.userLibInfo
     if (!listInfo || Object.keys(listInfo).length === 0) {
       return false
@@ -211,10 +222,13 @@ export default class UserLibrary extends Vue {
     })
   }
 
-  saveState () {
-    console.log('saveState')
+  saveScrollTop () {
     const wrapper: any = document.querySelector('.van-tabs__content')
     this.$data[this.keyForList].scrollTop = wrapper.scrollTop
+  }
+
+  saveState () {
+    this.saveScrollTop()
     const d = {
       tabActive: this.tabActive,
       myLibListState: this.myLibListState,