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源代码：
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<!DOCTYPE html> <html> <head> <style type="text/css"> #ex1 { border: 1px solid #FF0000; } </style> <script> function displayResult() { document.getElementById("ex1").style.borderBottomWidth="thick"; } </script> </head> <body> <div id="ex1">This is some text.</div> <br> <button type="button" onclick="displayResult()">Change width of bottom border</button> </body> </html>
运行结果
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