// index.html    

 //index.css * { box-sizing: border-box; } html { height: 100%; background-color: #111; font-size: 10px; } body { background-image: linear-gradient(0deg, transparent 24%, rgba(32, 255, 77, 0.15) 26%, transparent 27%, transparent 74%, rgba(32, 255, 77, 0.15) 76%, transparent 77%, transparent), linear-gradient(90deg, transparent 24%, rgba(32, 255, 77, 0.15) 26%, transparent 27%, transparent 74%, rgba(32, 255, 77, 0.15) 76%, transparent 77%, transparent); background-size: 8rem 8rem; width: 100%; height: 100%; position: relative; padding: 0; margin: 0; font-size: 1.6rem; } .radar { background: -webkit-radial-gradient(center, rgba(32, 255, 77, 0.3) 0%, rgba(32, 255, 77, 0) 75%), -webkit-repeating-radial-gradient(rgba(32, 255, 77, 0) 5.8%, rgba(32, 255, 77, 0) 18%, #20ff4d 18.6%, rgba(32, 255, 77, 0) 18.9%), -webkit-linear-gradient(90deg, rgba(32, 255, 77, 0) 49.5%, #20ff4d 50%, rgba(32, 255, 77, 0) 50.2%), -webkit-linear-gradient(0deg, rgba(32, 255, 77, 0) 49.5%, #20ff4d 50%, rgba(32, 255, 77, 0) 50.2%); width: 75vw; height: 75vw; max-height: 75vh; max-width: 75vh; position: relative; left: 50%; top: 50%; /* 元素居中定位 */ transform: translate(-50%, -50%); border-radius: 50%; border: 0.2rem solid #20ff4d; overflow: hidden; } .radar:before { content: ' '; display: block; position: absolute; width: 100%; height: 100%; border-radius: 50%; animation: blips 5s infinite; animation-timing-function: linear; animation-delay: 1.4s; } .radar:after { content: ' '; display: block; background-image: linear-gradient(44deg, rgba(0, 255, 51, 0) 50%, #00ff33 100%); width: 50%; height: 50%; position: absolute; top: 0; left: 0; animation: radar-beam 5s infinite; /* 速度相同 */ animation-timing-function: linear; transform-origin: bottom right; border-radius: 100% 0 0 0; } @keyframes radar-beam { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } } @keyframes blips { 14% { background: radial-gradient(2vmin circle at 75% 70%, #ffffff 10%, #20ff4d 30%, rgba(255, 255, 255, 0) 100%); } 14.0002% { background: radial-gradient(2vmin circle at 75% 70%, #ffffff 10%, #20ff4d 30%, rgba(255, 255, 255, 0) 100%), radial-gradient(2vmin circle at 63% 72%, #ffffff 10%, #20ff4d 30%, rgba(255, 255, 255, 0) 100%); } 25% { background: radial-gradient(2vmin circle at 75% 70%, #ffffff 10%, #20ff4d 30%, rgba(255, 255, 255, 0) 100%), radial-gradient(2vmin circle at 63% 72%, #ffffff 10%, #20ff4d 30%, rgba(255, 255, 255, 0) 100%), radial-gradient(2vmin circle at 56% 86%, #ffffff 10%, #20ff4d 30%, rgba(255, 255, 255, 0) 100%); } 26% { background: radial-gradient(2vmin circle at 75% 70%, #ffffff 10%, #20ff4d 30%, rgba(255, 255, 255, 0) 100%), radial-gradient(2vmin circle at 63% 72%, #ffffff 10%, #20ff4d 30%, rgba(255, 255, 255, 0) 100%), radial-gradient(2vmin circle at 56% 86%, #ffffff 10%, #20ff4d 30%, rgba(255, 255, 255, 0) 100%); opacity: 1; } 100% { background: radial-gradient(2vmin circle at 75% 70%, #ffffff 10%, #20ff4d 30%, rgba(255, 255, 255, 0) 100%), radial-gradient(2vmin circle at 63% 72%, #ffffff 10%, #20ff4d 30%, rgba(255, 255, 255, 0) 100%), radial-gradient(2vmin circle at 56% 86%, #ffffff 10%, #20ff4d 30%, rgba(255, 255, 255, 0) 100%); opacity: 0; } }