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CSS 动画
Tryit: 使用 animation-direction 属性
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<!DOCTYPE html> <html> <head> <style> div { width: 100px; height: 100px; background-color: red; position: relative; animation-name: example; animation-duration: 4s; animation-iteration-count: 2; animation-direction: alternate; } @keyframes example { 0% {background-color:red; left:0px; top:0px;} 25% {background-color:yellow; left:200px; top:0px;} 50% {background-color:blue; left:200px; top:200px;} 75% {background-color:green; left:0px; top:200px;} 100% {background-color:red; left:0px; top:0px;} } </style> </head> <body> <h1>CSS Animation</h1> <p>The animation-direction property specifies whether an animation should be played forwards, backwards or in alternate cycles. The following example uses the value "alternate" to make the animation run forwards first, then backwards:</p> <div></div> </body> </html>
