本文实例讲述了JS二级菜单不同实现方法。分享给大家供大家参考,具体如下:
之前面试的时候被问到过一次,后来,在笔试的时候又遇到了,为了长点记性,就决定把这个好好写写。
第一种:
第一种是采用css来控制的;主要采用float,和position,display,hover来完成的。具体看以参看后面的源代码。
第二种:
主要采用hover,和display来实现的。
第三种:
采用的是js来控制的,mouseover,mouseout来控制显示的。当然也利用了css.
第四种:
这种也是纯css的形式,主要利用display:inline-block;
和vertical-align:top;
来实现的。如果不用vertical-align的话,就会导致一级菜单被二级菜单顶起来,使得上面无法对其,因此才需要设置。
每一种对应的源码如下:
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>横排二级下拉菜单</title> <style type="text/css"> *{ margin: 0; padding: 0; list-style: none; text-decoration: none; color: #333; } .nav{ width: 400px; height: 150px; background: Gray; margin: 10px; overflow: hidden; } .nav ul li{ float :left; width: 100px; clear: right; } .nav ul li a:hover{ color:red; } .nav ul li ul { display:none; } .nav ul li:hover ul{ display:block; position: absolute; } .nav ul li:hover ul li{ float:none;/**/ } /********************************************************/ .nav2{ width: 400px; height: 200px; background: Gray; margin: 10px; } .nav2 ul li{ width: 100px; } .nav2 ul li li{ margin-left:20px; } .nav2 a:hover{ color: red; } .nav2 ul li ul { display: none; } .nav2 ul li:hover ul { display: block; } /********************************************************/ .nav3{ width: 400px; height: 150px; background: Gray; margin: 10px; } .nav3 ul li{ width: 100px; float: left; } .nav3 ul li ul{ display: none; position: absolute; } .nav3 ul li ul li{ float: none; } .nav3 ul li a:hover{ color:red; } /********************************************************/ .nav4{ width: 400px; height: 200px; } .nav4 ul li{ width:100px; display: inline-block; vertical-align: top; } .nav4 ul ul{ display: none; } .nav4 ul li:hover ul{ display: block; } .nav4 ul li a:hover{ color:red; } </style> </head> <body> <!--*****************111111111111111111111111111111111111***************/--> <div class="nav"> <ul> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external 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nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >二级栏目</a></li> <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >二级栏目</a></li> </ul> </li> </ul> </div> <script> var row=document.getElementsByClassName("row"); var length=row.length; for(var i=0;i<length;i++){ row[i].onmouseover=function(i){ var that=row[i]; return function(i){ child=that.childNodes; child[2].style.display="block"; } }(i); row[i].onmouseout=function(i){ var that=row[i]; return function(i){ child=that.childNodes; child[2].style.display="none"; } }(i); } console.log(row); </script> </body> </html>
PS:感兴趣的朋友还可使用在线HTML/CSS/JavaScript代码运行工具:http://tools.jb51.net/code/HtmlJsRun测试上述代码运行效果。
更多关于JavaScript相关内容感兴趣的读者可查看本站专题:《JavaScript操作DOM技巧总结》、《JavaScript页面元素操作技巧总结》、《JavaScript事件相关操作与技巧大全》、《JavaScript查找算法技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript错误与调试技巧总结》
希望本文所述对大家JavaScript程序设计有所帮助。
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