fix return back bug

Author: PanJiaChen

src/views/errorPage/404.vue

@@ -14,7 +14,7 @@
         </div>
         <div class="bullshit__headline">{{ message }}</div>
         <div class="bullshit__info">请检查您输入的网址是否正确，请点击以下按钮返回主页或者发送错误报告</div>
-        <a href="" class="bullshit__return-home">返回首页</a>
+        <router-link to="/" class="bullshit__return-home">返回首页</router-link>
       </div>
     </div>
   </div>