只能输入数字
<script>
function IsDigit()
{
return ((event.keyCode >= 48) && (event.keyCode <= 57));
}
</script>
<input id=e ONKEYPRESS="event.returnValue=IsDigit();" value="400" size="10" maxlength=3>
function IsDigit()
{
return ((event.keyCode >= 48) && (event.keyCode <= 57));
}
</script>
<input id=e ONKEYPRESS="event.returnValue=IsDigit();" value="400" size="10" maxlength=3>
