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<!DOCTYPE html> <html> <head> <style> #myDIV { border: 1px solid black; background-color: lightblue; width: 270px; height: 200px; overflow: auto; transition: all 2s; } #myDIV:hover { background-color: coral; width: 570px; height: 500px; padding: 100px; border-radius: 50px; } </style> </head> <body> <p>将鼠标悬停在 DIV 元素上，它会逐渐改变颜色和大小！</p> <p>单击“试一试”按钮，然后再次将鼠标悬停在 DIV 元素上。 变化还是会发生，只是宽度和高度会逐渐变化。</p> <button onclick="myFunction()">试一试</button> <div id="myDIV"> <h1>myDIV</h1> </div> <script> function myFunction() { document.getElementById("myDIV").style.transitionProperty = "width, height"; } </script> </body> </html>