这篇文章主要介绍了JavaScript实现鼠标经过显示下拉框的方法，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。
具体内容如下
代码：
<!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>Document</title> <style> * { margin: 0; padding: 0; } .nav { margin: 100px auto; width: 500px; } .nav>li { float: left; } li { list-style: none; } a { display: block; text-decoration: none; color: gray; height: 40px; width: 100px; text-align: center; line-height: 40px; box-sizing: border-box; } .nav>li>a { color: black; } .nav>li>a:hover { background-color: lightgray; } .nav>li>ul>li>a { border: 1px solid orange; border-top: none; } .nav>li>ul>li>a:hover { background-color: lightyellow; } .nav>li>ul { display: none; } </style></head><body> <ul class="nav" id=nav> <li> <a href="#" >新浪</a> <ul> <li><a href="#">新闻</a> </li> <li><a href="#">体育</a> </li> <li><a href="#">快讯</a> </li> <li><a href="#">生活</a> </li> <li><a href="#">微博</a> </li> </ul> </li> <li> <a href="#" >新浪</a> <ul> <li><a href="#">新闻1</a> </li> <li><a href="#">体育1</a> </li> <li><a href="#">快讯1</a> </li> <li><a href="#">生活1</a> </li> <li><a href="#">微博1</a> </li> </ul> </li> <li> <a href="#" >新浪</a> <ul> <li><a href="#">新闻2</a> </li> <li><a href="#">体育2</a> </li> <li><a href="#">快讯2</a> </li> <li><a href="#">生活2</a> </li> <li><a href="#">微博2</a> </li> </ul> </li> </ul> <script> var heads = document.querySelectorAll('.nav>li'); for (var i = 0; i < heads.length; i++) { heads[i].onmouseover = function() { this.children[1].style.display = "block"; } heads[i].onmouseout = function() { this.children[1].style.display = "none"; } } </script></body></html>感谢你能够认真阅读完这篇文章，希望小编分享的“JavaScript实现鼠标经过显示下拉框的方法”这篇文章对大家有帮助，同时也希望大家多多支持编程网，关注编程网行业资讯频道，更多相关知识等着你来学习!
