html 实现下拉菜单

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>水平下拉导航栏</title>
<style type="text/css">
body { /*设置内容与浏览器边框无间距*/
margin: 0;
padding: 0;
}


ul {
margin: 0;
padding: 0;
list-style-type: none; /*去除li前的标注*/
background-color: #333;
overflow: hidden; /*隐藏溢出的部分，保持一行*/
}




li {
float: left; /*左浮动*/
}




li a, .dropbtn {
display: inline-block; /*设置成块*/
color: white;
text-align: center;
text-decoration: none;
padding: 14px 16px;
/*border-style: solid;
border-color:  #909090 ; */
border:0.5px #999999 solid; 
}




li a:hover, .dropdown:hover .dropbtn { /*鼠标移上去，改变背景颜色*/
background-color: #111;
}


.dropdown {
/*display:inline-block将对象呈递为内联对象，但是对象的内容作为块对象呈递。旁边的内联对象会被呈递在同一行内，允许空格。*/
display: inline-block;
}




.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}


.dropdown-content a {
display: block;
color: black;
padding: 10px 15px;
text-decoration:none;
}


.dropdown-content a:hover {
background-color: #a1a1a1;
}


/*.dropdown:hover .dropdown-content{
display: block;
}*/


</style>

<script type="text/javascript">
    var isClick = true
    function show() {
        if(isClick)
        {
            document.getElementById('show').style.display = "block"
            isClick = false
        }else{
            document.getElementById('show').style.display = "none"
            isClick = true
        }
    }
    function show1() {
        alert("链接01")
    }
    function show2() {
        alert("链接02")
    }
    function show3() {
        alert("链接03")
    }
</script>
</head>
<body>
<ul>
<li><a href="#" class="active">主页</a></li>
<li><a href="#">新闻</a></li>
<div class="dropdown">
<!--a href="#" class="dropbtn">下拉菜单</a-->
<a href="#" class="dropbtn" onclick="show()">下拉菜单</a>
<div class="dropdown-content" id="show">
<a href="#" onclick="show1()">链接01</a>
<a href="#" onclick="show2()">链接02</a>
<a href="#" onclick="show3()">链接03</a>
</div>
</div>
</ul>
</body>
</html>
这里写图片描述
html 实现下拉菜单

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