[js] - 导航展出动画 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>菜单展出动画</title>
    <style>
        html,body{
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        ul{
            padding: 0;
            margin: 0;
            overflow: hidden;
            background-color: bisque;
        }
        ul li{
            height: 60px;
            line-height: 60px;
            text-align: center;
            list-style: none;
            cursor: pointer;
        }
        ul li:hover{
            background-color: aquamarine;
        }
        .show{
            animation: show 1s ease-in-out forwards;
        }
        .hide{
            animation: hide .3s forwards;
        }
        @keyframes show {
            from{
                height: 0px;
            }
            to{
                height: 240px;
            }
        }
        @keyframes hide {
            from{
                height: 240px;
            }
            to{
                height: 0px;
            }
        }
        #toggle{
            position: absolute;
            z-index: 10;
            padding: 10px 20px;
        }
    </style>
</head>
<body>
    
    <input type="submit" value="切换" id="toggle">

    <ul class="show">
        <li>
            <a>首页</a>
        </li>
        <li>
            <a>首页</a>
        </li>
        <li>
            <a>首页</a>
        </li>
        <li>
            <a>首页</a>
        </li>
    </ul>

    <script>
        const toggle = document.querySelector("#toggle");
        const ul = document.querySelector("ul")
        
        toggle.addEventListener("click",function(){
            if(getComputedStyle(ul).height=="0px"){
                ul.classList.remove("hide")
                ul.classList.add("show");
            }else{
                ul.classList.remove("show")
                ul.classList.add("hide");
            }
        },)
        
    </script>

</body>
</html>

 

posted @ 2021-06-22 15:00  武卡卡  阅读(40)  评论(0)    收藏  举报