diff --git a/页面指示器部分.html b/页面指示器部分.html
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index 0000000..20831d7
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+++ b/页面指示器部分.html
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>页面指示器部分</title>
+</head>
+<body>
+    <style>
+       .container{
+            width: 100%;
+            height: 2000px;
+        }
+       .back-to-top{
+            position: fixed;
+            bottom: 100px;
+            right: 100px;
+            width: 80px;
+            height: 80px;
+            background-color: #000;
+            color: #fff;
+            border-radius: 50%;
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            cursor: pointer;
+            opacity: 0;
+            transition: opacity 0.3s ease-in-out;
+        }
+        h1{
+            font-size: 50px;
+            text-align: center;
+        }
+    </style>
+    <div class="container">
+        <h1>Back To Top</h1>
+        
+        <div class="back-to-top">lll1</div>
+    </div>
+    <script>
+        const backToTopBtn = document.querySelector('.back-to-top');
+        window.addEventListener('scroll', () => {
+            if (window.scrollY > 300) {
+                backToTopBtn.style.opacity = 1;
+            } else {
+                backToTopBtn.style.opacity = 0;
+            }
+        });
+
+        backToTopBtn.addEventListener('click', () => {
+            window.scrollTo({
+                top: 0,
+                behavior:'smooth'
+            });
+        });
+    </script>
+
+</body>
+</html>
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