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<!DOCTYPE html> <html> <head> <style> div {position: absolute;} #container div { background-color: lightblue; border: 1px solid #333333; width: 100px; height: 100px; opacity: 0.5; } div#myBox { opacity: 1; background-color: coral; z-index: 1; animation: mymove 5s infinite linear; } @keyframes mymove { 50% {z-index: 5;} } </style> </head> <body style="position:absolute"> <h1>z-index 动画</h1> <p>逐渐将“myBox”的 z-index 属性从 1 更改为 5，然后再更改回 1：<p> <div id="container"> <div id="myBox">myBox</div> <div style="top:20px;left:20px;z-index:1;">z-index 1</div> <div style="top:40px;left:40px;z-index:2;">z-index 2</div> <div style="top:60px;left:60px;z-index:3;">z-index 3</div> <div style="top:80px;left:80px;z-index:4;">z-index 4</div> </div> <p><strong>注意：</strong>CSS 动画在 Internet Explorer 9 及更早版本中不起作用。</p> </body> </html>