修复外联跳转

src/pages/go.astro

@@ -27,7 +27,7 @@ const whitelist = externalLinkWhitelist.map((domain) => domain.toLowerCase());
 
       <div class="external-redirect-actions">
         <a class="external-redirect-button is-primary" href="/" data-continue hidden>立即访问</a>
-        <a class="external-redirect-button" href="/">返回首页</a>
+        <a class="external-redirect-button" href="/" data-back>返回上一页</a>
       </div>
     </div>
   </section>
@@ -42,6 +42,7 @@ const whitelist = externalLinkWhitelist.map((domain) => domain.toLowerCase());
     (() => {
       const params = new URLSearchParams(window.location.search);
       const rawUrl = params.get('url') || params.get('target') || params.get('to') || '';
+      const rawFrom = params.get('from') || '';
       const title = document.querySelector('[data-title]');
       const message = document.querySelector('[data-message]');
       const statusLabel = document.querySelector('[data-status-label]');
@@ -51,6 +52,7 @@ const whitelist = externalLinkWhitelist.map((domain) => domain.toLowerCase());
       const countdown = document.querySelector('[data-countdown]');
       const ring = document.querySelector('[data-countdown-ring]');
       const continueLink = document.querySelector('[data-continue]');
+      const backLink = document.querySelector('[data-back]');
       const circumference = 2 * Math.PI * 52;
 
       function setText(node, text) {
@@ -71,6 +73,24 @@ const whitelist = externalLinkWhitelist.map((domain) => domain.toLowerCase());
         setText(message, text);
       }
 
+      let returnUrl = '/';
+      try {
+        const fromUrl = new URL(rawFrom, window.location.origin);
+        if (fromUrl.origin === window.location.origin && fromUrl.pathname !== window.location.pathname) {
+          returnUrl = `${fromUrl.pathname}${fromUrl.search}${fromUrl.hash}`;
+        }
+      } catch {
+        returnUrl = '/';
+      }
+
+      if (backLink) backLink.href = returnUrl;
+
+      backLink?.addEventListener('click', (event) => {
+        if (window.history.length <= 1) return;
+        event.preventDefault();
+        window.history.back();
+      });
+
       let destination;
       try {
         destination = new URL(rawUrl);

src/styles/site.css

@@ -2316,7 +2316,7 @@ meting-js {
   position: relative;
   width: 112px;
   height: 112px;
-  margin-top: 26px;
+  margin: 26px auto 0;
 }
 
 .external-redirect-countdown svg {