add post date warning info

Author: Wsine

src/components/PostMeta.vue

@@ -1,9 +1,9 @@
 <template>
   <div class="post-meta">
     Posted {{ post.date }}.
-    <!-- <template v-if="post.timeToRead">
-      <strong>{{ post.timeToRead }} min read.</strong>
-    </template> -->
+    <div class="post-meta__warning" v-if="new Date().getTime() - new Date(post.date).getTime() > 365*24*60*60*1000">
+      <span>❕本篇文章距离发表已大于一年，部分信息可能已失效</span>
+    </div>
   </div>
 </template>
 
@@ -17,5 +17,9 @@ export default {
 .post-meta {
   font-size: 0.8em;
   opacity: 0.8;
+
+  &__warning {
+    font-size: 0.75em;
+  }
 }
 </style>