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左侧是商品内容,右侧是一个导航栏,当页面向下滚动的时候右侧导航栏也跟着移动。
当黄色内容区域到达顶部的时候,右侧导航栏变为固定的
当黑色内容区到达顶部时,右侧导航栏的返回顶部按钮显示
点击返回顶部内容区回到原来的位置,右侧导航栏也取消固定回到原来的位置。
具体实现:
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <title></title>
- <style>
- .slider_bar{
- position: absolute;
- width: 70px;
- height: 20px;
- border: 1px solid red;
- top: 500px;
- right: 0;
- }
- span{
- display: flex;
- border: 1px solid red;
-
- }
- .goBack{
- display: none;
- }
- .non{
- width: 500px;
- height: 200px;
- border: 1px solid red;
- }
- .header{
- width: 500px;
- height: 200px;
- background-color: aqua;
- margin-top: 0;
- }
- .banner{
- width: 500px;
- height: 500px;
- background-color: bisque;
- }
- .main{
- width: 500px;
- height: 1000px;
- background-color: black;
- }
- </style>
- </head>
- <body>
- <div class="slider_bar">
- <span class="yi">1</span>
- <span class="er">2</span>
- <span class="san">3</span>
- <span class="goBack">返回顶部</span>
- </div>
- <div class="non"></div>
- <div class="header"></div>
- <div class="banner"></div>
- <div class="main"></div>
-
- <script>
- var yi = document.querySelector('.yi');
- var er = document.querySelector('.er');
- var san = document.querySelector('.san');
-
- var sliderbar = document.querySelector('.slider_bar');
- var banner = document.querySelector('.banner');
- var bannerTop = banner.offsetTop;
- var sliderbarTop = sliderbar.offsetTop - bannerTop;
- var main = document.querySelector('.main');
- var goBack = document.querySelector('.goBack');
- var mainTOP = main.offsetTop;
- console.log(sliderbarTop);
- document.addEventListener('scroll', function(){
- if(window.pageYOffset >= bannerTop) {
- sliderbar.style.position = 'fixed';
- sliderbar.style.top = sliderbarTop + 'px';
- } else {
- sliderbar.style.position = 'absolute';
- sliderbar.style.top = '500px';
- };
- if(window.pageYOffset >= mainTOP){
- goBack.style.display = 'block';
- } else {
- goBack.style.display = 'none';
- };
- });
- goBack.addEventListener('click', function(){
- window.scroll(0,0);
- })
- </script>
- </body>
- </html>
以上就是本章的全部内容,感谢您的阅读。
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