data/attach/1907/5523skd9pzqkmv29rv10act9w1u1jmh6.jpg 用p3p跨域传cookie a_set.php   执行 
http://www.a.com/b_set.php http://www.a.com/a_get.php 得到 array(1) { ["test"]=> string(9) "www.b.com" }




js和cookie  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 SetCookie(name, value) 
//设定Cookie值 
{ 
var expdate = new Date(); 
var argv = SetCookie.arguments; 
var argc = SetCookie.arguments.length; 
var expires = (argc > 2) ? argv[2] : null; 
var path = (argc > 3) ? argv[3] : null; 
var domain = (argc > 4) ? argv[4] : null; 
var secure = (argc > 5) ? argv[5] : false; 
if(expires!=null) expdate.setTime(expdate.getTime() + ( expires * 1000 )); 
document.cookie = name + "=" + escape (value) +((expires == null) ? "" : ("; expires="+ expdate.toGMTString())) 
+((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "" : ("; domain=" + domain)) 
+((secure == true) ? "; secure" : ""); 
} 
function DelCookie(name) 
//删除Cookie 
{ 
var exp = new Date(); 
exp.setTime (exp.getTime() - 1); 
var cval = GetCookie (name); 
document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString(); 
} 
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; 
}