<form name=form1>
<table>
<tr id=pass>
<td>请输入小于978的正整数:</td>
<td><input type="text" name="num"/></td>
<input type=button value="是否是符合条件的整数" onclick="checknum()">
</tr>
</table>
</form>
<script language=javascript>
function checknum(){
alert(/^[1-9][0-7][0-7]$/.test(document.all.num.value))
}
</script>
<table>
<tr id=pass>
<td>请输入小于978的正整数:</td>
<td><input type="text" name="num"/></td>
<input type=button value="是否是符合条件的整数" onclick="checknum()">
</tr>
</table>
</form>
<script language=javascript>
function checknum(){
alert(/^[1-9][0-7][0-7]$/.test(document.all.num.value))
}
</script>
d{2}匹配两位数字
http://expert.csdn.net/Expert/topic/1375/1375158.xml?temp=.5592615