HW05-下拉菜单
使用JS实现下拉菜单效果
html代码如下
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
*{margin: 0; padding: 0; box-sizing: border-box;}
html,body {width: 100%; height: 100%;}
body{font-size: 62.5%;}
.top {
height: 50px;
width: 100%;
background-color: antiquewhite;
display: flex;
justify-content: center;
}
.head{
height: 100%;
width: 800px;
/* background-color: aquamarine; */
display: flex;
justify-content: space-around;
list-style: none;
position: relative;
right: 200px;
}
.head > .items{
padding: 10px 40px;
position: relative;
cursor: pointer;
font-size: 20px;
text-align: center;
}
.head > .items:hover{
background-color: #f2f2f1;
color: #333;
font-weight: 500;
}
.children{
display: none;
width: 100%;
list-style: none;
padding: 10px 10px;
position: absolute;
top: 50px;
left: 0;
background-color: antiquewhite;
}
.children > li{
width: 100%;
cursor: pointer;
line-height: 40px;
}
.children > li:hover{
background-color: #f2f2f1;
color: #333;
font-weight: 500;
}
</style>
</head>
<body>
<div class="top">
<ul class="head">
<li class="items">首页</li>
<li class="items">文章
<ul class="children">
<li>发表文章</li>
<li>我的文章</li>
<li>我的收藏</li>
</ul>
</li>
<li class="items">相册
<ul class="children">
<li>我的相册</li>
<li>上传照片</li>
</ul>
</li>
<li class="items">消息
<ul class="children">
<li>我的留言</li>
<li>我的私信</li>
</ul>
</li>
</ul>
</div>
<script>
let _ils = document.getElementsByClassName('items');
console.log(_ils);
for(let i = 0; i<_ils.length; i++){
_ils[i].onmouseenter = function(){
let _children = _ils[i].getElementsByClassName('children');
if(_children.length > 0){
let c = _children[0];
c.style.display = 'block';
}
}
_ils[i].onmouseleave = function(){
let _children = _ils[i].getElementsByClassName('children');
if(_children.length > 0){
let c = _children[0];
c.style.display = "none";
}
}
}
</script>
</body>
</html>
效果截图
image.png
