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CSS align-self 属性
trycss3_js_align-self
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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> <h1>Change align-self with JavaScript</h1> <div id="main"> <div style="background-color:coral;">RED</div> <div style="background-color:lightblue;" id="myBlueDiv">BLUE</div> <div style="background-color:lightgreen;">Green div with more content.</div> </div> <p>Click the "Try it" button to set the value of the alignSelf property to "stretch"</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { document.getElementById("myBlueDiv").style.alignSelf = "stretch"; } </script> </body> </html>