first commit

2024-09-27 02:06:13 +08:00
commit 852d94fbb9
36760 changed files with 3274413 additions and 0 deletions
--- a/历届学生/font-end-nine/项目练习/上课项目/js案例/滚动固定.html
+++ b/历届学生/font-end-nine/项目练习/上课项目/js案例/滚动固定.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>滚动固定</title>
+    <style>
+        body {
+            height: 30000px;
+        }
+
+        .header {
+            width: 100%;
+            height: 50px;
+            background: red;
+        }
+
+        .fixed {
+            position: fixed;
+            width: 100%;
+            left: 0;
+            top: 0;
+        }
+    </style>
+</head>
+<body>
+    
+    <div class="header"></div>
+</body>
+
+<script>
+
+    var header = $(".header");
+
+    $("body").onscroll = function () {
+         if (document.documentElement.scrollTop > 100) {
+            header.className = "header fixed"
+        } else {
+            header.className = "header"
+        }
+        console.log("页面被滚动了");
+    }
+
+     function $(className) {
+        return document.querySelector(className)
+    }
+
+</script>
+</html>