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关于IP验证的一个例子
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平时感觉Windows的IP输入框很好用，如果再网页中也能实现一定是很爽的事情。核心代码如下：
<script language="javascript">
function outStr(){
if(document.all.ip1.value>0 && document.all.ip2.value>0 && document.all.ip3.value>0 && document.all.ip4.value>0){
alert("你输入的IP地址为：" + document.all.ip1.value + "." + document.all.ip2.value + "." + document.all.ip3.value + "." + document.all.ip4.value);
}//end if
}//end
function moveRight(obj){
id = parseInt(obj.name.substr(2,1))
if(id<4){
eval("document.all.ip" + (id +1) + ".focus()");
}else{
outStr();
}//end if
}
function moveLeft(obj){
id = parseInt(obj.name.substr(2,1))
if(id>1){
eval("document.all.ip" + (id -1) + ".focus()");
}//end if
}//end if
function Keypress(obj){
var objInput = obj;
cod = window.event.keyCode;
if(cod==46 && (obj.value).length>0){//如果按了“.”并且有了一个字符，向右移动一次
window.event.keyCode=0;
moveRight(obj);
}else if((obj.value).length==2 && (cod >= 48) && (cod <= 57)){//如果数字键并且够了两位
if(cod<58){//
obj.value = obj.value * 10 + cod - 48;
}//end if
window.event.keyCode = 0;
moveRight(obj);
}else{ //判断输入的是不是数字
if ( !(((cod >= 48) && (cod <= 57)) || (cod == 13) || (cod == 37) || (cod == 39))){
window.event.keyCode = 0;
}//end if
}//end if
}//end function keydown
function getCaretPos(obj){
var currentRange=document.selection.createRange();
var workRange=currentRange.duplicate();
obj.select();
var allRange=document.selection.createRange();
var len=0;
while(workRange.compareEndPoints("StartToStart",allRange)>0){
workRange.moveStart("character",-1);
len++;
}
currentRange.select();
return len;
}//end
function KeyDown(obj){
cod = window.event.keyCode;
i = getCaretPos(obj); //光标位置
n = obj.value.length; //字符长度
if(cod==37 && i==0){//光标左移
moveLeft(obj);
}else if(cod==39 && i>=n){
moveRight(obj);
}else if(cod==8 && (obj.value=="" || i==0)){
moveLeft(obj);
}//end if
}//end
function checkDate(obj,max_num){
if(obj.value>max_num || obj.value<0){
window.event.keyCode = 0;
alert(obj.value + "是无效的项目，只能输入0到" + max_num + "之间的数。");
obj.value = max_num;
obj.focus();
obj.select();
}//end if
}//end
</script>
测试网址：http://www.yemaweb.com/test/ipv1.0.htm
源代码全部在网页中，没有任何加密，希望使用时不要去掉出处。
<script language="javascript">
function outStr(){
if(document.all.ip1.value>0 && document.all.ip2.value>0 && document.all.ip3.value>0 && document.all.ip4.value>0){
alert("你输入的IP地址为：" + document.all.ip1.value + "." + document.all.ip2.value + "." + document.all.ip3.value + "." + document.all.ip4.value);
}//end if
}//end
function moveRight(obj){
id = parseInt(obj.name.substr(2,1))
if(id<4){
eval("document.all.ip" + (id +1) + ".focus()");
}else{
outStr();
}//end if
}
function moveLeft(obj){
id = parseInt(obj.name.substr(2,1))
if(id>1){
eval("document.all.ip" + (id -1) + ".focus()");
}//end if
}//end if
function Keypress(obj){
var objInput = obj;
cod = window.event.keyCode;
if(cod==46 && (obj.value).length>0){//如果按了“.”并且有了一个字符，向右移动一次
window.event.keyCode=0;
moveRight(obj);
}else if((obj.value).length==2 && (cod >= 48) && (cod <= 57)){//如果数字键并且够了两位
if(cod<58){//
obj.value = obj.value * 10 + cod - 48;
}//end if
window.event.keyCode = 0;
moveRight(obj);
}else{ //判断输入的是不是数字
if ( !(((cod >= 48) && (cod <= 57)) || (cod == 13) || (cod == 37) || (cod == 39))){
window.event.keyCode = 0;
}//end if
}//end if
}//end function keydown
function getCaretPos(obj){
var currentRange=document.selection.createRange();
var workRange=currentRange.duplicate();
obj.select();
var allRange=document.selection.createRange();
var len=0;
while(workRange.compareEndPoints("StartToStart",allRange)>0){
workRange.moveStart("character",-1);
len++;
}
currentRange.select();
return len;
}//end
function KeyDown(obj){
cod = window.event.keyCode;
i = getCaretPos(obj); //光标位置
n = obj.value.length; //字符长度
if(cod==37 && i==0){//光标左移
moveLeft(obj);
}else if(cod==39 && i>=n){
moveRight(obj);
}else if(cod==8 && (obj.value=="" || i==0)){
moveLeft(obj);
}//end if
}//end
function checkDate(obj,max_num){
if(obj.value>max_num || obj.value<0){
window.event.keyCode = 0;
alert(obj.value + "是无效的项目，只能输入0到" + max_num + "之间的数。");
obj.value = max_num;
obj.focus();
obj.select();
}//end if
}//end
</script>
测试网址：http://www.yemaweb.com/test/ipv1.0.htm
源代码全部在网页中，没有任何加密，希望使用时不要去掉出处。
#2楼发布者：webptr时间：2007-10-06 09:27:23
检测IP地址的javascript
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME=\"Generator\" CONTENT=\"EditPlus\">
<META NAME=\"Author\" CONTENT=\"\">
<META NAME=\"Keywords\" CONTENT=\"\">
<META NAME=\"Description\" CONTENT=\"\">
</HEAD>
<BODY>
<script language=\"javascript\">
function ipCheck()
{
ipValue=document.form1.ipaddr.value;
var reg = /^\\d{1,3}(\\.\\d{1,3}){3}$/;
if(reg.test(ipValue))
{
var ary = ipValue.split(\'.\');
for(key in ary)
{
if(parseInt(ary[key]) > 255)
{
alert(\"IP error\");
document.form1.ipaddr.focus();
return false;
}
}
}else{
alert(\"IP error\");
document.form1.ipaddr.focus();
return false;
}
}
</script>
<form method=\"post\" action=\"\" onsubmit=\"return ipCheck()\" name=form1>
<input type=text name=ipaddr>
<INPUT TYPE=\"submit\">
</form>
</BODY>
</HTML>
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME=\"Generator\" CONTENT=\"EditPlus\">
<META NAME=\"Author\" CONTENT=\"\">
<META NAME=\"Keywords\" CONTENT=\"\">
<META NAME=\"Description\" CONTENT=\"\">
</HEAD>
<BODY>
<script language=\"javascript\">
function ipCheck()
{
ipValue=document.form1.ipaddr.value;
var reg = /^\\d{1,3}(\\.\\d{1,3}){3}$/;
if(reg.test(ipValue))
{
var ary = ipValue.split(\'.\');
for(key in ary)
{
if(parseInt(ary[key]) > 255)
{
alert(\"IP error\");
document.form1.ipaddr.focus();
return false;
}
}
}else{
alert(\"IP error\");
document.form1.ipaddr.focus();
return false;
}
}
</script>
<form method=\"post\" action=\"\" onsubmit=\"return ipCheck()\" name=form1>
<input type=text name=ipaddr>
<INPUT TYPE=\"submit\">
</form>
</BODY>
</HTML>