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<!DOCTYPE html> <html> <head> <style> #myDiv { border: thick solid blue; } </style> </head> <body> <div id="myDiv">这是一个 DIV 元素。</div> <br> <button type="button" onclick="myFunction()">改变右边框</button> <script> function myFunction() { document.getElementById("myDiv").style.borderRight = "thin dotted red"; } </script> </body> </html>