fix[TagsView]: fixed update tags title demo bug (#1223)

Author: PanJiaChen

src/views/example/components/ArticleDetail.vue

@@ -143,7 +143,8 @@ export default {
         title: [{ validator: validateRequire }],
         content: [{ validator: validateRequire }],
         source_uri: [{ validator: validateSourceUri, trigger: 'blur' }]
-      }
+      },
+      tempRoute: {}
     }
   },
   computed: {
@@ -161,6 +162,11 @@ export default {
     } else {
       this.postForm = Object.assign({}, defaultForm)
     }
+
+    // Why need to make a copy of this.$route here?
+    // Because if you enter this page and quickly switch tag, may be in the execution of the setTagsViewTitle function, this.$route is no longer pointing to the current page
+    // https://github.com./PanJiaChen/vue-element-admin/issues/1221
+    this.tempRoute = Object.assign({}, this.$route)
   },
   methods: {
     fetchData(id) {
@@ -178,7 +184,7 @@ export default {
     },
     setTagsViewTitle() {
       const title = this.lang === 'zh' ? '编辑文章' : 'Edit Article'
-      const route = Object.assign({}, this.$route, { title: `${title}-${this.postForm.id}` })
+      const route = Object.assign({}, this.tempRoute, { title: `${title}-${this.postForm.id}` })
       this.$store.dispatch('updateVisitedView', route)
     },
     submitForm() {