修改切换黑白背景的文字为图片

src/assets/scss/theme/_dark.scss

@@ -1,6 +1,7 @@
 #dark,
 #dark header {
   background: #131722 !important;
+  border-bottom: 1px solid #2d2c2c;
 }
 
 #dark header nav a {

src/components/CommonHeader.vue

@@ -91,7 +91,9 @@
                     </li> -->
                     <li class="nav-item dropdown">
 						<a class="nav-link sight-sense" href="javascript:changeSightSense()">
-							{{theme=='light'?'白天模式':'夜晚模式'}}
+							<!-- {{theme=='light'?'白天模式':'夜晚模式'}} -->
+							<img width="25px" height="25px" v-if="theme == 'light'" src="../assets/img/home/sun.png" />
+							<img width="25px" height="25px" v-else src="../assets/img/home/moon.png" />
 						</a>
                     </li>