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CSS 动画
试用：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-reverse; } @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-reverse" to make the animation run backwards first, then forwards:</p> <div></div> </body> </html>
