<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> * { margin: 0; padding: 0; } li { list-style-type: none; } a { text-decoration: none; font-size: 14px; } .nav { margin: 100px; } .nav>li { position: relative; float: left; width: 80px; height: 41px; text-align: center; } .nav li a { display: block; width: 100%; height: 100%; line-height: 41px; color: #333; } .nav>li>a:hover { background-color: #eee; } .nav ul { display: none; position: absolute; top: 41px; left: 0; width: 100%; border-left: 1px solid #FECC5B; border-right: 1px solid #FECC5B; } .nav ul li { border-bottom: 1px solid #FECC5B; } .nav ul li a:hover { background-color: #FFF5DA; } </style> </head> <body> <ul class="nav"> <li> <a href="#">微博</a> <ul> <li> <a href="">私信</a> </li> <li> <a href="">评论</a> </li> <li> <a href="">@我</a> </li> </ul> </li> <li> <a href="#">微博</a> <ul> <li> <a href="">私信</a> </li> <li> <a href="">评论</a> </li> <li> <a href="">@我</a> </li> </ul> </li> <li> <a href="#">微博</a> <ul> <li> <a href="">私信</a> </li> <li> <a href="">评论</a> </li> <li> <a href="">@我</a> </li> </ul> </li> <li> <a href="#">微博</a> <ul> <li> <a href="">私信</a> </li> <li> <a href="">评论</a> </li> <li> <a href="">@我</a> </li> </ul> </li> </ul> <script> // 1. 获取元素 var nav = document.querySelector('.nav'); var lis = nav.children; // 得到4个小li // 2.循环注册事件 for (var i = 0; i < lis.length; i++) { lis[i].onmouseover = function() { this.children[1].style.display = 'block'; } lis[i].onmouseout = function() { this.children[1].style.display = 'none'; } } </script> </body> </html>
