JavaScript实现简单的下拉菜单_用js做出一个下拉菜单列表有5个选项,dom操作选中第三项-优快云博客

本文链接：https://blog.youkuaiyun.com/user_ylc/article/details/3129012

本文介绍了一种使用JavaScript实现的简单下拉菜单效果。通过点击菜单标题可以显示或隐藏下拉选项，适用于早期Web页面的设计需求。代码中包含了具体的HTML结构、CSS样式及JavaScript交互逻辑。

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JavaScript实现简单的下拉菜单

2007-02-02 09:00

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>下拉菜单</title>
<style>

.cardbottom {
BACKGROUND-COLOR: #99ccff; BORDER-BOTTOM: black 1px solid; BORDER-LEFT: black 1px

solid; BORDER-RIGHT: black 1px solid; BORDER-TOP: black 0px solid; FILTER: Alpha(Opacity=80)
}

</style>
<script language="javascript" type="text/javascript">
function aa(){
if(document.getElementById("Layer2").style.display == "none"){
document.getElementById("Layer2").style.display ="list-item";
document.getElementById("Layer1").innerText="关闭";
return;
}
if(document.getElementById("Layer2").style.display == "list-item"){
document.getElementById("Layer2").style.display="none";
document.getElementById("Layer1").innerText="打开";
return;
}
}
function bb(){
if(document.getElementById("Layer4").style.display == "none"){
document.getElementById("Layer4").style.display ="list-item";
document.getElementById("Layer3").innerText="关闭";
return;
}
if(document.getElementById("Layer4").style.display == "list-item"){
document.getElementById("Layer4").style.display="none";
document.getElementById("Layer3").innerText="打开";
return;
}

}

</script>
</head>

<body>
<div id="Layer1"  class="cardbottom"  style="width:100px; "onClick="aa()">打开</div>
<div id="Layer2"  class="cardbottom" style="width:100px; " style="display:none;" >
  选项一<br>
  选项二<br>
  选项三
</div>
<div id="Layer3"  class="cardbottom" style="width:100px; " onClick="bb()">打开</div>
<div id="Layer4" class="cardbottom"  style="width:100px; "style="display:none ">
  选项一<br>
  选项二<br>
  选项三
</div>
</body>
</html>