代码如下：
<form name="datecheck" method="POST" onsubmit="return dateCheck(this.date.value);">
<table border="0" cellpadding="8" cellspacing="0" width="50%">
<tr>
<td align="right" nowrap>Birth Date (DD/MM/YYYY):</td>
<td><input type=text name="date" size="25"></td>
</tr>
<tr>
<td class="center" colspan="2">
<input type=submit value="发送">
<input type=reset value="重写">
</td>
</tr>
</table>
</form>
<script type="text/javascript" language="javascript">
function dateCheck(str){
var re = new RegExp("^([0-9]{1,2})[./]{1}([0-9]{1,2})[./]{1}([0-9]{4})$");
var ar;
var res = true;
if ((ar = re.exec(str)) != null){
var i;
i = parseFloat(ar[1]);
// verify dd
if (i <= 0 || i > 31){
res = false;
}
i = parseFloat(ar[2]);
// verify mm
if (i <= 0 || i > 12){
res = false;
}
}else{
res = false;
}
if (!res){
alert('请输入 DD/MM/YYYY 日期格式');
}
else{
alert("success");
}
return res;
}
</script>
验证日期格式是否为dd/mm/yyyy
