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<!DOCTYPE html> <html> <head> <style> div { width: 100px; height: 100px; background: red; position: relative; animation: mymove 2s infinite; } @keyframes mymove { from {left: 0px;} to {left: 200px;} } @keyframes myNEWmove { from {width: 0px;} to {width: 500px; background: blue;} } </style> </head> <body> <h1>HTML Style 对象</h1> <h2>animationName 属性</h2> <p>点击“试一试”按钮可更改动画中使用的关键帧：</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { document.getElementById("myDIV").style.animationName = "myNEWmove"; } </script> <div id="myDIV"></div> </body> </html>