整理文檔，搜刮出一個css3實現wifi訊號逐漸增強效果執行個體的代碼，稍微整理精簡一下做下分享。
下面是實現代碼：
<!DOCTYPE html><meta charset="utf-8"><html><head> <title>wifi訊號</title> <style type="text/css"> *{ margin: 0; padding: 0; } .box { width: 240px; height: 240px; box-sizing: border-box; position: relative; margin: 100px auto; } .wifi-symbol { width: 200px; height: 200px; margin-left: 18px; box-sizing: border-box; overflow: hidden; transform: rotate(45deg); } .wifi-circle { border: 10px solid #ccc; border-radius: 50%; position: absolute; } .first { width: 260px; height: 260px; top: 0; left: 0; animation: run1 4s linear infinite; } @keyframes run1 { 0% { border-color: #ccc; } 25% { border-color: #ccc; } 50% { border-color: #ccc; } 75% { border-color: #ccc; } 100% { border-color: #97a8e6; } } .second { width: 200px; height: 200px; top: 60px; left: 60px; animation: run2 4s linear infinite; } @keyframes run2 { 0% { border-color: #ccc; } 25% { border-color: #ccc; } 50% { border-color: #ccc; } 75% { border-color: #97a8e6; } 100% { border-color: #ccc; } } .third { width: 140px; height: 140px; top: 120px; left: 120px; animation: run3 4s linear infinite; } @keyframes run3 { 0% { border-color: #ccc; } 25% { border-color: #ccc; } 50% { border-color: #97a8e6; } 75% { border-color: #ccc; } 100% { border-color: #ccc; } } .fourth { width: 20px; height: 20px; background: #ccc; top: 180px; left: 180px; animation: run4 4s linear infinite; } @keyframes run4 { 0% { background: #ccc; border-color: #ccc; } 25% { background: #97a8e6; border-color: #97a8e6; } 50% { background: #ccc; border-color: #ccc; } 75% { background: #ccc; border-color: #ccc; } 100% { background: #ccc; border-color: #ccc; } } </style></head><body> <p class="box"> <p class="wifi-symbol"> <p class="wifi-circle first"></p> <p class="wifi-circle second"></p> <p class="wifi-circle third"></p> <p class="wifi-circle fourth"> </p> </p></body></html>
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