JS Read and write (delete) Cookie example detailed _javascript tips

Copy Code code as follows:

JS Operation Cookie Method!
Write cookies
function Setcookie (name,value)
{
var days = 30;
var exp = new Date ();
Exp.settime (Exp.gettime () + days*24*60*60*1000);
Document.cookie = name + "=" + Escape (value) + "expires=" + exp.togmtstring ();
}
Read cookies
function GetCookie (name)
{
var arr,reg=new RegExp ("(^|)" +name+ "= ([^;] *)(;|$)");
if (Arr=document.cookie.match (reg)) return unescape (arr[2]);
else return null;
}
Delete Cookies
function Delcookie (name)
{
var exp = new Date ();
Exp.settime (Exp.gettime ()-1);
var cval=getcookie (name);
if (cval!=null) document.cookie= name + "=" +cval+ "; expires=" +exp.togmtstring ();
}
Using the sample
Setcookie ("name", "Hayden");
Alert (GetCookie ("name"));
If you need to set custom expiration times
Then replace the above Setcookie function with the following two functions on OK;
Program code
function SetCookie2 (name,value,time) {
var strsec = getsec (time);
var exp = new Date ();
Exp.settime (Exp.gettime () + strsec*1);
Document.cookie = name + "=" + Escape (value) + "expires=" + exp.togmtstring ();
}
function Getsec (str) {
alert (str);
var str1=str.substring (1,str.length) *1;
var str2=str.substring (0,1);
if (str2== "s") {
return str1*1000;
}else if (str2== "H") {
return str1*60*60*1000;
}else if (str2== "D") {
return str1*24*60*60*1000;
}
}
This is an example of a usage that has a set expiration time:
S20 is representing 20 seconds.
H refers to the hour, such as 12 hours is: H12
D is the number of days, 30 days: D30
For the time being, I only wrote these three kinds of
SetCookie2 ("Name2", "Hayden2", "S20");
Alert (GetCookie ("name2"));

Here are a few of the more common handy functions:

Copy Code code as follows:

function Getcookieval (offset)
Get the value of the cookie after decoding
{
var endstr = document.cookie.indexOf (";", offset);
if (endstr = = 1)
Endstr = Document.cookie.length;
Return unescape (document.cookie.substring (offset, endstr));
}
function Setcookie (name, value)
Set cookie Value
{
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)
Delete Cookies
{
var exp = new Date ();
Exp.settime (Exp.gettime ()-1);
var cval = GetCookie (name);
Document.cookie = name + "=" + Cval + "; Expires= "+ exp.togmtstring ();
}
function GetCookie (name)
Get the original value of the cookie
{
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;
}
Test
Setcookie ("Sunshine", "1986");
Alert (GetCookie ("Sunshine"));