</HTML> b.php<script language="javascript" type="text/javascript"> //alert("1111"); function GetCookieVal(offset) //获得Cookie解码后的值 { var endstr = document.cookie.indexOf (";", offset); if (endstr == -1) endstr = document.cookie.length; return unescape(document.cookie.substring(offset, endstr)); } function GetCookie(name) //获得Cookie的原始值 { var arg = name + "="; var alen = arg.length; var clen = document.cookie.length; var i = 0; while (i < clen) { var j = i + alen; if (document.cookie.substring(i, j) == arg) return GetCookieVal (j); i = document.cookie.indexOf(" ", i) + 1; if (i == 0) break; } return null; } alert(GetCookieVal("name"));</script>
var d = '<?php echo $data;?>';
<script language='javascript'>
alert(document.getElementById('phpvalue').value);
</script>
function $(id){
return document.getElementById(id);
}
window.onload = function(){
$('name').onblur = function(){ //name就是你登陆页面用户名输入框的名字
var Lname=$('name').value;
var name=encodeURIComponent(Lname);
xmlhttp.open('get','chkuser.php?name='+name,true);
xmlhttp.onreadystatechange = function(){
if(xmlhttp.readyState == 4){
if(xmlhttp.status == 200){
var msg = xmlhttp.responseText;
if(msg == '1'){
alert('对不起!你已经登录.');
}else{
alert('你还没有登录.');
}
}
}
}
xmlhttp.send(null);
}}PHP部分:
\\就是chkuser.php
<?php
session_start();
$Lname=$_GET['name'];
$name=@$_SESSION['name'];
if($Lname==$name){
echo '1';
}else{
echo '0';
}
?>我没有验证,不过应该没问题,至少思路应该行得通,你试试看
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<script type="text/javascript" language="javascript">
</script>
</HEAD>
<BODY>
<form method="post" action="#" >
<input type="text" name="11" id="11">
<input type="submit" value="xiayibu" >
</form>
</BODY> <?php
$tmp=$_POST['11'];
if($tmp=="aa")
{
$url="b.php";
setcookie('name', $tmp);
header("Location:$url");
}
?>
</HTML>
b.php<script language="javascript" type="text/javascript">
//alert("1111");
function GetCookieVal(offset)
//获得Cookie解码后的值
{
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}
function GetCookie(name)
//获得Cookie的原始值
{
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while (i < clen)
{
var j = i + alen;
if (document.cookie.substring(i, j) == arg)
return GetCookieVal (j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0) break;
}
return null;
}
alert(GetCookieVal("name"));</script>