Detailed explanation of js reading and writing (deleting) Cookie instances_javascript skills

Copy code The code is as follows:

//JS cookie operation 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();
}
//Usage example
setCookie("name","hayden");
alert(getCookie("name")) ;
//If you need to set a custom expiration time
//Then replace the above setCookie function with the following two functions;
//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 setting the expiration time:
//s20 represents 20 seconds
//h refers to hours, such as 12 hours :h12
//d is the number of days, 30 days: d30
//Only these three are written for now
setCookie2("name2","hayden2","s20");
alert (getCookie("name2"));

The following are some common and useful functions:

Copy code The code is as follows:

function GetCookieVal(offset)
//Get the decoded value of the Cookie
{
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 Cookie
{
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 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"));