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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script> function displayResult(){ document.getElementById("b1").style.height="50px"; } </script> </head> <body> <input type="button" id="b1" onclick="displayResult()" value="修改按钮高度"> </body> </html>