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Tryit: JAVASCRIPT
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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 100px; height: 100px; background: yellow; -webkit-transition: 2s; /* For Safari 3.1 to 6.0 */ transition: 2s; } #myDIV:hover { width: 400px; } </style> </head> <body> <p>将鼠标悬停在下方的 div 元素上，等待过渡效果结束。</p> <p>elapsedTime 属性返回过渡效果已运行的秒数。</p> <div id="myDIV"></div> <p><b>注意：</b>此示例不适用于 Internet Explorer 9 和更早版本。</p> <script> // Code for Safari 3.1 to 6.0 document.getElementById("myDIV").addEventListener("webkitTransitionEnd", myFunction); // 标准语法 document.getElementById("myDIV").addEventListener("transitionend", myFunction); function myFunction(event) { this.innerHTML = "Transition lasted: " + event.elapsedTime + " 秒"; } </script> </body> </html>