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JavaScript代碼：
<script type="text/javascript">function doyear(){var select = document.getElementById("year");var thisYear = new Date().getFullYear();for(var i=1900;i<=thisYear;i++){var option = document.createElement("option");option.value = i;option.innerText = i;select.appendChild(option);}}function domoth(){var select = document.getElementById("month");for(var i=1;i<=12;i++){var option = document.createElement("option");option.value = i;option.innerText = i;select.appendChild(option);}}function doday(){var select = document.getElementById("day"); var selectYear = parseInt(year.options[year.selectedIndex].value);var selectMonth = parseInt(month.options[month.selectedIndex].value); var date = new Date(selectYear,selectMonth,0);for(var i=1;i<=date.getDate();i++){var option = document.createElement("option");option.value = i;option.innerText = i;select.appendChild(option);}}function deleteOldChildNodes(){var day = document.getElementById("day");var node=day.firstChild;var tmpNode;while(node!=day.lastChild){tmpNode = node.nextSibling;day.removeChild(node);node = tmpNode;}day.removeChild(day.lastChild);}function pageInit(){doyear();domoth();doday();year.onchange = function(){deleteOldChildNodes();doday();};month.onchange = function(){deleteOldChildNodes();doday();};}</script>HTML頁面代碼片：
<body style="text-align: center" onload="pageInit()"> <table width="70%" frame="border"> <tr> <td>生日</td> <td> <select name="year" id="year"></select>年 <select name="month" id="month"></select>月 <select name="day" id="day"></select>日 </td> </tr> </table> </body>
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