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<!DOCTYPE html> <html> <head> <style> div#main { width: 220px; height: 300px; border: 1px solid black; display: flex; align-items: center; } div#main div { flex: 1; } </style> </head> <body> <h1>HTML Style 对象</h1> <h2>alignItems 属性</h2> <div id="main"> <div style="background-color:coral;">红色</div> <div style="background-color:lightblue;">蓝色</div> <div style="background-color:lightgreen;">有更多内容的绿色 DIV。</div> </div> <p>单击按钮将 alignItems 属性的值设置为“flex-start”。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { document.getElementById("main").style.alignItems = "flex-start"; } </script> </body> </html>