<!DOCTYPE html> <html> <head> <style> /* @-webkit-keyframes anim1 { // 规定动画。 0% { Opacity: 0; font-size: 12px; } 100% { Opacity: 1; font-size: 34px; } } .anim1Div { -webkit-animation-name: anim1 ; 规定 @keyframes 动画的名称 -webkit-animation-duration: 1.5s; 规定动画完成一个周期所花费的秒或毫秒。默认是 0 -webkit-animation-iteration-count: 400; 规定动画被播放的次数。默认是 1。 -webkit-animation-direction: alternate; 规定动画是否在下一周期逆向地播放。默认是 "normal"。 -webkit-animation-timing-function: ease-in-out; 规定动画的速度曲线。默认是 "ease"。 } */ div { 100px; height:100px; background:red; position:relative; animation:myfirst 5s linear 2s infinite alternate; /* Firefox: */ -moz-animation:myfirst 5s linear 2s infinite alternate; /* Safari and Chrome: */ -webkit-animation:myfirst 5s linear 2s infinite alternate; /* Opera: */ -o-animation:myfirst 5s linear 2s infinite alternate; } @keyframes myfirst /* 需要用@keyframes来申明动画的名称*/ {/*从0%一直到100%的渐变过程*/ 0% {background:red; left:0px; top:0px;} 25% {background:yellow; left:200px; top:0px;} 50% {background:blue; left:200px; top:200px;} 75% {background:green; left:0px; top:200px;} 100% {background:red; left:0px; top:0px;} } @-moz-keyframes myfirst /* Firefox */ { 0% {background:red; left:0px; top:0px;} 25% {background:yellow; left:200px; top:0px;} 50% {background:blue; left:200px; top:200px;} 75% {background:green; left:0px; top:200px;} 100% {background:red; left:0px; top:0px;} } @-webkit-keyframes myfirst /* Safari and Chrome */ { 0% {background:red; left:0px; top:0px;} 25% {background:yellow; left:200px; top:0px;} 50% {background:blue; left:200px; top:200px;} 75% {background:green; left:0px; top:200px;} 100% {background:red; left:0px; top:0px;} } @-o-keyframes myfirst /* Opera */ { 0% {background:red; left:0px; top:0px;} 25% {background:yellow; left:200px; top:0px;} 50% {background:blue; left:200px; top:200px;} 75% {background:green; left:0px; top:200px;} 100% {background:red; left:0px; top:0px;} } </style> </head> <body> <p><b>注释：</b>本例在 Internet Explorer 中无效。</p> <div></div> </body> </html>