How to write the code for javascript to hide the drop-down menu

This article mainly introduces the "javascript hidden drop-down menu code how to write" related knowledge, editor through the actual case to show you the operation process, the method of operation is simple and fast, practical, I hope that this "javascript hidden drop-down menu code how to write" article can help you solve the problem.

Javascript hides the drop-down menu by first creating a "demo.html" and "demo.css", then creating a "demo.js", and finally hiding it through "function hideSubMenu (li) {...}".

This article operating environment: windows7 system, javascript1.8.5 version, Dell G3 computer.

How does javascript hide drop-down menus?

Javascript realizes the display and hiding of drop-down menus

Demo.html

Realize the drop-down menu effect on the home page of the course hall JavaScript Html/CSS learning center video learning examples question and answer A classic case about us.

Demo.js

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";}

Demo.css

* {margin:0px; padding:0px;} body {font-family:Verdana, Geneva, sans-serif; font-size:14px;} # nav {width:600px; height:40px; background-color:#eee; margin:0 auto;} ul {list-style:none;} ul li {float:left; line-height:40px; text-align:center; width:100px;} a {text-decoration:none; color:#000; display:block;} a:hover {color:#F00; background-color:#666 } ul li ul li {float:none;background-color:#eee; margin:2px 0px;} ul li ul {display:none;}

Effect:

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