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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script> function addBorder(){ document.getElementById("compman").border="2"; } </script> </head> <body> <img id="compman" src="compman.gif" alt="Computerman" width="107" height="98"> <br><br> <input type="button" onclick="addBorder()" value="加上边框"> </body> </html>