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下面是看視頻時做的練習，在這裡儲存一下
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>判斷閏年</title><script language="javascript" type="text/javascript">function aaa(){var x=document.form1.nian.value;if(((x%4==0) && (x%100!=0)) || ((x%100==0) && (x%400==0))){alert(x + "年是閏年！");}else{alert(x + "年不是閏年！");}}</script></head><body> <form id="form1" name="form1" method="post" action"">判斷閏年： <input name="nian" type="text" id="nian" size="4" maxlength="4"/> <input type="button" name="button" value="是否是閏年？" onclick="javascript:aaa()"/> </form></body></html>Start building with 50+ products and up to 12 months usage for Elastic Compute Service
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