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<!DOCTYPE html> <html> <head> <style> #main { width: 220px; height: 300px; border: 1px solid black; display: flex; align-items: flex-start; } #main div { flex: 1; } #myBlueDiv { align-self: center; } </style> </head> <body> <div id="main"> <div style="background-color:coral;">红色</div> <div style="background-color:lightblue;" id="myBlueDiv">蓝色</div> <div style="background-color:lightgreen;">包含更多内容的绿色 div。</div> </div> <p>单击该按钮将 alignSelf 属性的值设置为“stretch”</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { document.getElementById("myBlueDiv").style.alignSelf = "stretch"; } </script> <p><b>注意：</b> Internet Explorer 10 及更早版本不支持 alignSelf 属性。</p> </body> </html>