京东页面指示器和返回顶部

1 month ago · e94d590d1b
parent 294cba86a8
commit e94d590d1b
1 changed files with 113 additions and 0 deletions
--- a/京东导航.html
+++ b/京东导航.html
@ -0,0 +1,113 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>仿京东页面</title>
+    <style>
+        *{
+            padding: 0;
+            margin: 0;
+           
+        }
+        .boxbig{
+            position: relative;
+            width: 100%;
+            height: 40px;
+            background-color: #e4e4e4;
+            text-align: center;
+            line-height: 40px;
+        }
+        .boxbig ul{
+            display:flex;
+            /* 小圆点没了 */
+            list-style: none;
+            justify-content:center;
+        }
+        .boxbig ul li{
+            margin: 0 20px;
+            font-size: 20px;
+        }
+        .boxbig  ul li a{
+            /* 下划线没了 */
+            text-decoration:none;
+            color: black;
+            border-bottom: 2px solid transparent;
+        }
+         .boxbig ul li a.active{
+            border-color: #e1251b;
+            color: #e1251b;
+        }
+        .box2{
+            
+            width: 100%;
+            height: 1000px;
+            background-color: pink;
+        }
+        .box2 p{
+            font-size: 30px;
+            text-align: center;
+           margin: 50px 0;
+        }
+        .box3{
+            position: fixed;
+            width: 50px;
+            height: 50px;
+            border-radius: 50%;
+            background-color: aliceblue;
+            bottom: 15px;
+            right: 15px;
+            display: none;
+        }
+    </style>
+</head>
+<body>
+    <div class="boxbig" >
+        <ul>
+            <li><a href="#"  class="active">首页</a></li>
+            <li><a href="#">动画</a></li>
+            <li><a href="#">番剧</a></li>
+            <li> <a href="#">音乐</a></li>
+            <li> <a href="#">舞蹈</a></li>
+        </ul>       
+    </div>
+   <div class="box2">
+<p>到这里出现返回按钮</p>
+   </div>
+   <div class="box3"></div>
+    <script>
+        //1.获取元素
+        const a=document.querySelectorAll('.boxbig a')
+        let i=0
+        console.log(a[0])
+ for(let i=0;i<a.length;i++){
+                a[i].addEventListener('mouseenter',function(){
+                    console.log('鼠标移入')
+document.querySelector('.boxbig .active').classList.remove('active')
+this.classList.add('active')
+                })
+            }
+      const p=document.querySelector('.box2 p')
+      const btn=document.querySelector('.box3')
+      const boxbig=document.querySelector('.boxbig')
+//页面滚动事件
+window.addEventListener('scroll',function(){
+    // console.log('页面滚动了')
+    //页面卷去的头部>=定位位置的距离
+    if(window.pageYOffset>=p.offsetTop){
+        document.querySelector('.box3').style.display='block'
+    }else{
+        document.querySelector('.box3').style.display='none'
+    }
+
+})
+  //按钮点击事件
+btn.addEventListener('click',function(){
+    boxbig.scrollIntoView({
+        block:"start"
+    })
+})
+
+    </script>
+</body>
+</html>