那个效果很多,比如hao123的头部
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <link rel="stylesheet" href="css/style.css"/> <script type="text/javascript" src="js/nav-top.js" ></script> </head> <body> <div id="nav"> <ul> <li>1</li> <li>2</li> <li>3</li> <li>4</li> </ul> </div> <div id="content"> </div> </body> </html>
* { padding: 0; margin: 0; } #nav { width: 800px; height: 50px; background: red; margin: auto; position: absolute; left: 514px; top: 50px; } #nav ul li { text-decoration: none; list-style: none; float: left; width: 180px; } #content { width: 800px; height: 1500px; background: black; margin: auto; margin-top: 50px; }
window.onload =scroll; addEventListener("scroll",getHeight); function getHeight () { var scrollHeigh = document.body.scrollTop; if(scrollHeigh > 50) { document.getElementById(‘nav‘).style.top=scrollHeigh+"px"; }else { document.getElementById(‘nav‘).style.top=50+"px"; } }
document.body.scrollTop
document.body.offsetWidth + " (包括边线和滚动条的宽)";
网页可见区域宽: document.body.clientWidth 网页可见区域高: document.body.clientHeight 网页可见区域宽: document.body.offsetWidth (包括边线的宽) 网页可见区域高: document.body.offsetHeight (包括边线的高) 网页正文全文宽: document.body.scrollWidth 网页正文全文高: document.body.scrollHeight 网页被卷去的高: document.body.scrollTop 网页被卷去的左: document.body.scrollLeft 网页正文部分上: window.screenTop 网页正文部分左: window.screenLeft 屏幕分辨率的高: window.screen.height 屏幕分辨率的宽: window.screen.width 屏幕可用工作区高度: window.screen.availHeight 屏幕可用工作区宽度: window.screen.availWidth
时间: 2024-10-19 08:00:48