JS实现下拉菜单列表与登录注册弹窗效果

时间：2021-05-26

下拉菜单列表

<style> *{ margin: 0px; padding: 0px; } .menu{ width: 1100px; height: 30px; background-image: url(img/魅力罗兰Music炫图18.jpg); margin-left: 200px; margin-top: 50px; } .btn{ width: 183.3px; height: 30px; float: left; text-align: center; line-height: 30px; font-size: 14px; position: relative; overflow: hidden; transition: 0.5s; } .btn:hover{ cursor: pointer; background-color: burlywood; color: white; max-height: 200px; overflow: visible; } .btn ul{ list-style: none; background-color: #008000; } </style> <body> <div class="menu"> <div class="btn">罗兰首页</div> <div class="btn">歌曲专栏 <ul> <li>流行</li> <li>摇滚</li> <li>蓝调</li> <li>民谣</li> </ul> </div> <div class="btn">音乐人专栏 <ul> <li>内地</li> <li>欧美</li> <li>日韩</li> <li>港台</li> </ul> </div> <div class="btn">乐器专栏 <ul> <li>钢琴</li> <li>小提琴</li> <li>吉他</li> <li>架子鼓</li> </ul> </div> <div class="btn">戏曲专栏 <ul> <li>京剧</li> <li>话剧</li> <li>豫剧</li> <li>黄梅戏</li> </ul> </div> <div class="btn">魅力ROLAND体验区 <ul> <li>新曲</li> <li>唱片</li> <li>MV</li> </ul> </div> </div> </body>

登录注册弹窗效果

<html> <head> <meta charset="UTF-8"> <title></title> <style> * { margin: 0px; padding: 0px; } .login { width: 100px; height: 30px; font-size: 25px; line-height: 30px; border: 1px solid black; text-align: center; background-color: darkcyan; color: white; } .login:hover { cursor: pointer; background-color: greenyellow; } .mask { width: 100%; background-color: black; opacity: 0.5; position: absolute; top: 0px; left: 0px; z-index: 90; } .log-div { width: 500px; height: 300px; background-color: white; position: fixed; z-index: 99; } </style> </head> <body> <div class="mask" hidden></div> <div class="log-div" hidden="hidden"></div> <div class="login">登 录</div> <p>123</p><p>123</p><p>123</p><p>123</p><p>123</p><p>123</p><p>123</p> <p>123</p><p>123</p><p>123</p><p>123</p><p>123</p><p>123</p><p>123</p> <p>123</p><p>123</p><p>123</p><p>123</p><p>123</p><p>123</p><p>123</p> <p>123</p><p>123</p><p>123</p><p>123</p><p>123</p><p>123</p> </body></html><script> var mask = document.getElementsByClassName("mask")[0]; var login = document.getElementsByClassName("log-div")[0]; var btn = document.getElementsByClassName("login")[0]; var clientWidth = document.body.clientWidth; var clientHeight = document.documentElement.clientHeight; login.style.left = clientWidth / 2 - 250 + "px"; login.style.top = clientHeight / 2 - 150 + "px"; mask.style.height = document.body.clientHeight + "px"; window.onresize = function() { var clientWidth = document.body.clientWidth; var clientHeight = document.documentElement.clientHeight; login.style.left = clientWidth / 2 - 250 + "px"; login.style.top = clientHeight / 2 - 150 + "px"; } btn.onclick = function(){ mask.removeAttribute("hidden"); login.removeAttribute("hidden"); } mask.onclick = function(){ mask.setAttribute("hidden",""); login.setAttribute("hidden","hidden"); }</script>

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