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                ??碼云GVP開源項目 12k star Uniapp+ElementUI 功能強大 支持多語言、二開方便! 廣告
                ![](https://img.kancloud.cn/98/21/9821dfabaf1f5bdd039f369363f6842b_986x480.png) ``` <!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>Document</title> <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.1/jquery.js"></script> </head> <body> <div class="navbar"> <input type="checkbox"> <span></span> <span></span> <ul> <li><a href="#">點贊</a></li> <li><a href="#">關注</a></li> <li><a href="#">收藏</a></li> <li><a href="#">評論</a></li> <li><a href="#">分享</a></li> </ul> </div> <style> * { margin: 0; padding: 0; } body { height: 100vh; /* 背景漸變 */ background: linear-gradient(200deg, #ddd6f3, #faaca8); } /* 三個元素都需要彈性布局,所以寫一塊 */ body, .navbar, .navbar ul { display: flex; justify-content: center; align-items: center; } .navbar { /* 相對定位 */ position: relative; padding: 20px; background-color: #fff; border-radius: 50px; } .navbar input { width: 40px; height: 40px; /* 不透明度設置為0,直接變透明 */ opacity: 0; /* 鼠標變小手 */ cursor: pointer; } .navbar span { /* 絕對定位 */ position: absolute; left: 25px; /* 現將兩條線都放到一起,然后單獨設置第二條線的位置,calc方法可以自動計算數值 */ top: calc(50% - 10px); width: 30px; height: 4px; border-radius: 15px; background-color: #999; /* 現在span覆蓋著復選框,鼠標放到span上是點不中復選框的,這個屬性就能解決這個問題,即便鼠標放到span上點擊也能選中或取消選中復選框 */ pointer-events: none; /* 收回來的時候過渡剛好是相反的 */ transition: transform 0.3s ease-in-out, top 0.3s ease-in-out 0.3s; } /* 因為第二條線在navbar這個元素內的第三個位置,所這里寫3 */ .navbar span:nth-child(3) { top: calc(50% + 6px); } .navbar ul { width: 0; /* 溢出隱藏 */ overflow: hidden; /* 現在展開和收起速度太快了,加個過渡 */ transition: all 0.5s; /* 現在導航欄收起的時候,這個圓是扁的 */ /* 這個問題是因為文字被換行顯示了,兩個漢字豎著排列了,所以盒子被撐大了,下面這個屬性就可以解決這個問題,讓文字不換行顯示 */ white-space: nowrap; } .navbar ul li { list-style: none; margin: 0px 15px; } .navbar ul li a { /* 取消下劃線 */ text-decoration: none; font-size: 20px; font-weight: 700; color: #333; } .navbar ul li a:hover { color: #fb7299; } /* :checked是當復選框被選中的時候,~是兄弟選擇器,查找同一級的ul */ .navbar input:checked~ul { width: 350px; } .navbar input:checked~span:nth-child(2) { top: calc(50% - 2px); transform: rotate(-45deg); background-color: #fb7299; /* 這里先執行top,然后0.3秒后執行transform */ transition: top 0.3s ease-in-out, transform 0.3s ease-in-out 0.3s; } .navbar input:checked~span:nth-child(3) { top: calc(50% - 2px); transform: rotate(45deg); background-color: #fb7299; transition: top 0.3s ease-in-out, transform 0.3s ease-in-out 0.3s; } </style> <script> </script> </body> </html> ```
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