添加源代码链接，修改链接打开方式

src/App.vue

@@ -1,6 +1,9 @@
 <script setup>
 import NavBar from "./components/NavBar.vue";
 import AppFooter from "./components/AppFooter.vue";
+const openGitHubRepo = () => {
+  window.open("https://github.com/Kisechan/Mainpage", "_self");
+};
 </script>
 
 <template>
@@ -9,12 +12,17 @@ import AppFooter from "./components/AppFooter.vue";
     <transition name="fade" mode="out-in">
       <router-view />
     </transition>
+    <el-tooltip content="查看本站源代码" placement="left" class="github-tooltip">
+      <div class="github-corner" @click="openGitHubRepo">
+        <i class="fa-solid fa-code"></i></div
+    ></el-tooltip>
     <AppFooter v-if="!$route.meta.hideFooter" />
   </div>
 </template>
 
 <style scoped>
-html, body {
+html,
+body {
   height: 100%;
   margin: 0;
   padding: 0;
@@ -39,4 +47,17 @@ html, body {
 .fade-leave-to {
   opacity: 0;
 }
+
+.github-corner {
+  position: fixed;
+  bottom: 20px;
+  right: 20px;
+  font-size: 2em;
+  cursor: pointer;
+  color: var(--text-color);
+  transition: color 0.3s ease;
+}
+.github-corner:hover {
+  color: #409eff;
+}
 </style>