JavaScript implements a very simple and practical drop-down menu effect

JavaScript implements a very simple and practical drop-down menu effect_javascript skills

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Release： 2016-05-16 15:42:09

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The example in this article describes how to implement a very simple and practical drop-down menu effect in JavaScript. Share it with everyone for your reference. The details are as follows:

This is a practical JS drop-down menu. Move the mouse over the menu to display the secondary menu. It was compiled from other websites. It took a lot of time to modify it. Now it has removed some useless code and it is more concise. , and the code compatibility seems to be good. This two-level drop-down menu is basically implemented by CSS and JavaScript. It is really simple and practical.

The screenshot of the running effect is as follows:

The online demo address is as follows:

http://demo.jb51.net/js/2015/js-css-down-show-menu-codes/

The specific code is as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" > 
<head runat="server"> 
<title>JavaScript下拉菜单</title> 
<style type="text/css"> 
* { 
padding:0; 
margin:0; 
} 
body { 
font-family:verdana, sans-serif; 
font-size:14px; background-color:#000;
} 
#navigation, #navigation li ul { 
list-style-type:none; 
} 
#navigation { 
} 
#navigation li { 
float:left; 
text-align:center; 
position:relative; 
} 
#navigation li a:link, #navigation li a:visited { 
display:block; 
text-decoration:none; 
color:#fff; 
width:82px; 
height:40px; 
line-height:40px; 
border:1px solid #fff; 
border-width:1px 1px 0 0; 
background:#255f9e; 
padding-left:10px; 
} 
#navigation li a:hover { 
color:#fff; 
background:#ffb100; 
} 
#navigation li ul li a:hover { 
color:#fff; 
background:#ffb100
} 
#navigation li ul { 
display:none; 
position:absolute; 
top:40px;
margin-top:1px; 
font-size:12px;
} 
</style> 
<script type="text/javascript"> 
function displaySubMenu(li) { 
var subMenu = li.getElementsByTagName("ul")[0]; 
subMenu.style.display = "block"; 
} 
function hideSubMenu(li) { 
var subMenu = li.getElementsByTagName("ul")[0]; 
subMenu.style.display = "none"; 
} 
</script> 
</head> 
<body> 
<ul id="navigation"> 
<li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
<a href="#">菜单1</a> 
<ul> 
<li><a href="#">菜单1</a></li> 
<li><a href="#">菜单1</a></li> 
<li><a href="#">菜单1</a></li> 
<li><a href="#">菜单1</a></li> 
</ul> 
</li> 
<li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
<a href="#">菜单2</a> 
<ul> 
<li><a href="#">栏目2</a></li> 
<li><a href="#">栏目2</a></li> 
<li><a href="#">栏目2</a></li> 
<li><a href="#">栏目2</a></li> 
<li><a href="#">栏目2</a></li> 
</ul> 
</li>
<li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
<a href="#">菜单3</a> 
<ul> 
<li><a href="#">菜单3</a></li> 
<li><a href="#">菜单3</a></li> 
<li><a href="#">菜单3</a></li> 
<li><a href="#">菜单3</a></li> 
<li><a href="#">菜单3</a></li> 
</ul> 
</li>
<li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
<a href="#">菜单4</a> 
<ul> 
<li><a href="#">菜单4</a></li> 
<li><a href="#">菜单4</a></li> 
<li><a href="#">菜单4</a></li> 
<li><a href="#">菜单4</a></li> 
<li><a href="#">菜单4</a></li> 
</ul> 
</li>
<li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
<a href="#">栏目5</a> 
<ul> 
<li><a href="#">菜单5</a></li> 
<li><a href="#">菜单5</a></li> 
<li><a href="#">菜单5</a></li> 
<li><a href="#">菜单5</a></li> 
<li><a href="#">菜单5</a></li> 
</ul> 
</li><li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
<a href="#">栏目6</a> 
<ul> 
<li><a href="#">菜单6</a></li> 
<li><a href="#">菜单6</a></li> 
<li><a href="#">菜单6</a></li> 
<li><a href="#">菜单6</a></li> 
<li><a href="#">菜单6</a></li> 
</ul> 
</li><li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
<a href="#">栏目7</a> 
<ul> 
<li><a href="#">菜单7</a></li> 
<li><a href="#">菜单7</a></li> 
<li><a href="#">菜单7</a></li> 
<li><a href="#">菜单7</a></li> 
<li><a href="#">菜单7</a></li> 
</ul> 
</li><li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
<a href="#">栏目8</a> 
<ul> 
<li><a href="#">菜单8</a></li> 
<li><a href="#">菜单8</a></li> 
<li><a href="#">菜单8</a></li> 
<li><a href="#">菜单8</a></li> 
<li><a href="#">菜单8</a></li> 
</ul> 
</li><li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
<a href="#">栏目09</a> 
<ul> 
<li><a href="#">菜单9</a></li> 
<li><a href="#">菜单9</a></li> 
<li><a href="#">菜单9</a></li> 
<li><a href="#">菜单9</a></li> 
<li><a href="#">菜单9</a></li> 
</ul> 
</li><li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
<a href="#">栏目10</a> 
<ul> 
<li><a href="#">菜单10</a></li> 
<li><a href="#">菜单10</a></li> 
<li><a href="#">菜单10</a></li> 
<li><a href="#">菜单10</a></li> 
<li><a href="#">菜单10</a></li> 
</ul> 
</li><li onmouseover="displaySubMenu(this)" onmouseout="hideSubMenu(this)"> 
<a href="#">栏目11</a> 
<ul> 
<li><a href="#">菜单11</a></li> 
<li><a href="#">菜单11</a></li> 
<li><a href="#">菜单11</a></li> 
<li><a href="#">菜单11</a></li> 
<li><a href="#">菜单11</a></li> 
</ul> 
</li>
</li> 
</ul> 
</li> 
</ul> 
</body> 
</html>

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I hope this article will be helpful to everyone’s JavaScript programming design.