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<!DOCTYPE html> <html> <head> <style> div { width: 100px; height: 100px; background: red; position: relative; animation: mymove 5s infinite; } @keyframes mymove { from {left: 0px;} to {left: 200px;} } </style> </head> <body> <p>单击“试一试”按钮可反转动画的方向。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { document.getElementById("myDIV").style.animationDirection = "reverse"; } </script> <div id="myDIV"></div> </body> </html>