<HTML>
<head>
<title>IP地址输入</title>
<meta http-equiv="Content-Type" content="text/HTML; charset=gb2312">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<script>
function mask(obj)
{
obj.value = obj.value.replace(/[^/d]/g, '');
var key1 = event.keyCode;
if (key1 == 37 || key1 == 39)
{
obj.blur();
nextip = parseInt(obj.name.substr(2,1));
nextip = (key1 == 37) ? nextip - 1 : nextip + 1;
nextip = (nextip >= 5) ? 1 : nextip;
nextip = (nextip <= 0) ? 4 : nextip;
eval("ip" + nextip + ".focus()");
}
if(obj.value.length >= 3)
if(parseInt(obj.value) >= 256 || parseInt(obj.value) <= 0)
{
alert(parseInt(obj.value) + " IP地址错误！");
obj.value="";
obj.focus();
return false;
}
else
{
obj.blur();
nextip = parseInt(obj.name.substr(2,1)) + 1;
nextip = (nextip >= 5) ? 1 : nextip;
nextip = (nextip <= 0) ? 4 : nextip;
eval("document.getElementById(/'" + "ip" + nextip + "/').focus()");
}
}
function mask_c(obj)
{
clipboardData.setData('text',clipboardData.getData('text').replace(/[^/d]/g,''))
}
</script>
</head>
<body>
IP地址输入:
<input type=text name=ip1 maxlength=3 size=3 onkeyup="mask(this)" onbeforepaste=mask_c()>.
<input type=text name=ip2 maxlength=3 size=3 onkeyup="mask(this)" onbeforepaste=mask_c()>.
<input type=text name=ip3 maxlength=3 size=3 onkeyup="mask(this)" onbeforepaste=mask_c()>.
<input type=text name=ip4 maxlength=3 size=3 onkeyup="mask(this)" onbeforepaste=mask_c()>
</body>
</HTML>
尚待改进：
1.按“.”自动跳到下一个框
2.ie 和ff 的不兼容，例：event.keyCode仅在ＩＥ下好用。