输入特定数字的控制

下面为效果显示

脚本说明:
把如下代码加入<body>区域中
<script type='text/javascript'>
// [dFilter] - A Numerical Input Mask for JavaScript
// Written By Dwayne Forehand - March 27th, 2003
// Please reuse & redistribute while keeping this notice.

var dFilterStep

function dFilterStrip (dFilterTemp, dFilterMask)
{
    dFilterMask = replace(dFilterMask,'#','');
    for (dFilterStep = 0; dFilterStep < dFilterMask.length++; dFilterStep++)
		{
		    dFilterTemp = replace(dFilterTemp,dFilterMask.substring(dFilterStep,dFilterStep+1),'');
		}
		return dFilterTemp;
}

textbox.value = dFilterFinal;
    return false;
}

function replace(fullString,text,by) {
// Replaces text with by in string
    var strLength = fullString.length, txtLength = text.length;
    if ((strLength == 0) || (txtLength == 0)) return fullString;

var i = fullString.indexOf(text);
    if ((!i) && (text != fullString.substring(0,txtLength))) return fullString;
    if (i == -1) return fullString;

var newstr = fullString.substring(0,i) + by;

if (i+txtLength < strLength)
        newstr += replace(fullString.substring(i+txtLength,strLength),text,by);

return newstr;
}

</script> 
<form name="fred" action="fred.htm" method="post">
<table>
    <tr>
		    <td>输入数字:</td>
				<td><input value="" type="text" onKeyDown="javascript:return dFilter (event.keyCode, this, '###-##-####');" style="font-family:verdana;font-size:10pt;width:110px;"></td>
		</tr>
    <tr>
        <td>电话号码:</td>
				<td><input value="" type="text" onKeyDown="javascript:return dFilter (event.keyCode, this, '(###) ###-####');" style="font-family:verdana;font-size:10pt;width:110px;"></td>
		</tr>
		<tr>
        <td>邮政编码:</td>
				<td><input value="" type="text" onKeyDown="javascript:return dFilter (event.keyCode, this, '###-###');" style="font-family:verdana;font-size:10pt;width:110px;"></td>
		</tr>
</table>
</form>