fixed 返回顶部功能

themes/Ying/static/css/main.css

@@ -756,6 +756,8 @@ ul {
     color: #111827;
     text-decoration: none;
     box-shadow: 0 10px 20px rgba(0, 0, 0, 0.06);
+    z-index: 2147483647; /* Ensure it's on top */
+    cursor: pointer;
 }
 
 #scrollUp::before {
@@ -2795,6 +2797,53 @@ img[atk-emoticon] {
 /* GenericInserted */ [data-theme="dark"] .chroma .gi { color:#50fa7b;font-weight:bold }
 /* GenericOutput */ [data-theme="dark"] .chroma .go { color:#44475a }
 /* GenericPrompt */ [data-theme="dark"] .chroma .gp {  }
+
+/* Back to Top Button */
+#back-to-top {
+    position: fixed;
+    bottom: 30px;
+    right: 30px;
+    width: 40px;
+    height: 40px;
+    background-color: var(--bankuai-color);
+    color: var(--text-content-color);
+    border-radius: 50%;
+    text-align: center;
+    line-height: 40px;
+    font-size: 24px;
+    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
+    cursor: pointer;
+    z-index: 2147483647;
+    opacity: 0;
+    visibility: hidden;
+    transition: opacity 0.3s, visibility 0.3s, background-color 0.3s, transform 0.3s;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    text-decoration: none;
+}
+
+#back-to-top.show {
+    opacity: 1;
+    visibility: visible;
+}
+
+#back-to-top:hover {
+    background-color: var(--erji-color);
+    color: #fff;
+    transform: translateY(-3px);
+}
+
+[data-theme="dark"] #back-to-top {
+    background-color: var(--bankuai-dark-color);
+    color: var(--text-content-dark-color);
+    box-shadow: 0 2px 5px rgba(255,255,255,0.1);
+}
+
+[data-theme="dark"] #back-to-top:hover {
+    background-color: #444;
+    color: #fff;
+}
 /* GenericStrong */ [data-theme="dark"] .chroma .gs {  }
 /* GenericSubheading */ [data-theme="dark"] .chroma .gu { font-weight:bold }
 /* GenericTraceback */ [data-theme="dark"] .chroma .gt {  }

themes/Ying/static/js/main.js

@@ -10,12 +10,43 @@ function isMobile() {
 // 文章图片灯箱
 window.ViewImage && ViewImage.init('.post-content img');
 
-// 激活返回顶部插件 
-$(function () {
-  $.scrollUp({
-    animation: 'fade',
-    scrollImg: true
-  });
+// Pure JavaScript Back to Top (High Performance)
+document.addEventListener('DOMContentLoaded', function() {
+    var backToTopButton = document.getElementById('back-to-top');
+    if (backToTopButton) {
+        var isVisible = false;
+        var ticking = false;
+
+        function update() {
+            if (window.scrollY > 300) {
+                if (!isVisible) {
+                    backToTopButton.classList.add('show');
+                    isVisible = true;
+                }
+            } else {
+                if (isVisible) {
+                    backToTopButton.classList.remove('show');
+                    isVisible = false;
+                }
+            }
+            ticking = false;
+        }
+
+        window.addEventListener('scroll', function() {
+            if (!ticking) {
+                window.requestAnimationFrame(update);
+                ticking = true;
+            }
+        }, { passive: true });
+
+        backToTopButton.addEventListener('click', function(e) {
+            e.preventDefault();
+            window.scrollTo({
+                top: 0,
+                behavior: 'smooth'
+            });
+        });
+    }
 });
 
 // loader定时器