@ key frames hovertreemove { from { top :30px;} to {top:130px;} }
可以通过 @keyframes 规则,创建动画。
创建动画的原理是,将一套 CSS 样式逐渐变化为另一套样式。
在动画过程中,您能够多次改变这套 CSS 样式。
以百分比来规定改变发生的时间,或者通过关键词 "from" 和 "to",等价于 0% 和 100%。
0% 是动画的开始时间,100% 动画的结束时间。
为了获得最佳的浏览器支持,您应该始终定义 0% 和 100% 选择器。
以下为上下运动的代码:
<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <meta name="viewport" content="width=device-width, initial-scale=1" /> <title>css3使用animation和@keyframes制作动画_何问起</title> <meta charset="utf-8" /> <style>@keyframes hovertreemove{from {top:30px;}to {top:130px;}} #hovertreekf{ width:80px;height:80px; border:1px solid red; position:absolute; background:url(http://hovertree.com/themes/hvtimages/smile.png) no-repeat center; animation:hovertreemove /*动画样式名称*/ 1s /*动画时间*/ linear /*线性运动*/ infinite /*无限播放*/ alternate/*往返动画*/;} a{color:blue;text-decoration:none;} </style></head><body><a href="http://hovertree.com/h/bjaf/i309b77d.htm" target="_blank">说明</a> <p id="hovertreekf"></p></body></html>
以下为圆形扩散运动的代码:
<!DOCTYPE html><html><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <title>纯css3圆形从中心向四周扩散动画效果_何问起</title> <style> @keyframes warn { 0% { transform: scale(0.3); -webkit-transform: scale(0.3); opacity: 0.0; } 25% { transform: scale(0.3); -webkit-transform: scale(0.3); opacity: 0.1; } 50% { transform: scale(0.5); -webkit-transform: scale(0.5); opacity: 0.3; } 75% { transform: scale(0.8); -webkit-transform: scale(0.8); opacity: 0.5; } 100% { transform: scale(1); -webkit-transform: scale(1); opacity: 0.0; } } @keyframes warn1 { 0% { transform: scale(0.3); -webkit-transform: scale(0.3); opacity: 0.0; } 25% { transform: scale(0.3); -webkit-transform: scale(0.3); opacity: 0.1; } 50% { transform: scale(0.3); -webkit-transform: scale(0.3); opacity: 0.3; } 75% { transform: scale(0.5); -webkit-transform: scale(0.5); opacity: 0.5; } 100% { transform: scale(0.8); -webkit-transform: scale(0.8); opacity: 0.0; } } .container { position: relative; width: 40px; height: 40px; /*border: 1px solid #000; hovertree.com */ } /* 保持大小不变的小圆圈 何问起 */ .dot { position: absolute; width: 92px; height: 92px; left: 120px; top: 120px; -webkit-border-radius: 50%; -moz-border-radius: 50%; border: 2px solid red; border-radius: 50%; z-index: 2; } /* 产生动画(向外扩散变大)的圆圈 */ .pulse { position: absolute; width: 320px; height: 320px; left: 2px; top: 2px; border: 6px solid red; -webkit-border-radius: 50%; -moz-border-radius: 50%; border-radius: 50%; z-index: 1; opacity: 0; -webkit-animation: warn 2s ease-out; -moz-animation: warn 2s ease-out; animation: warn 2s ease-out; -webkit-animation-iteration-count: infinite; -moz-animation-iteration-count: infinite; animation-iteration-count: infinite; box-shadow: 1px 1px 30px red; } .pulse1 { position: absolute; width: 320px; height: 320px; left: 2px; top: 2px; border: 6px solid red; -webkit-border-radius: 50%; -moz-border-radius: 50%; border-radius: 50%; z-index: 1; opacity: 0; -webkit-animation: warn1 2s ease-out; -moz-animation: warn1 2s ease-out; animation: warn1 2s ease-out; -webkit-animation-iteration-count: infinite; -moz-animation-iteration-count: infinite; animation-iteration-count: infinite; box-shadow: 1px 1px 30px red; }a{color:blue;text-decoration:none;} </style></head><body><a href="http://hovertree.com/h/bjaf/i309b77d.htm" target="_blank">说明</a> <p class="container"> <p class="dot"></p> <p class="pulse"></p> <p class="pulse1"></p> </p></body></html>