Use of JS cookies

There are many ways to set up a cookie in JS.

The first type: (This is the Code of the website)

<script>//set Cookiefunction Setcookie (CNAME, cvalue, Exdays,cpath) {//Note: The function call in JS can be different from the number of parameters defined,    Call when you do not need to add the next two arguments or the last parameter) var d = new Date (); D.settime (D.gettime () + (exdays*24*60*60*1000));var expires = "expires=" +d.toutcstring ();//Expiration time is the word expites
var path = "path=" +cpath;//path setting, the word used is pathDocument.cookie = cname + "=" + Cvalue + ";" + expires+ ";" +path;}    Get cookiefunction GetCookie (CNAME) {var name = cname + "=";    var ca = Document.cookie.split (';');        for (var i=0; i<ca.length; i++) {var c = ca[i];        while (C.charat (0) = = ") c = c.substring (1);    if (C.indexof (name)! =-1) return c.substring (Name.length, c.length); } return "";}  Clear Cookie function ClearCookie (name) {Setcookie (name, "any character can, generally set to NULL, the key is the time behind",-1);    } function Checkcookie () {var user = GetCookie ("username");    if (User! = "") {alert ("Welcome again" + user);        } else {user = prompt ("Please enter your name:", "" ");        if (User! = "" "&& user! = null) {Setcookie (" username ", user, 365); }}}checkcookie (); </script>

The second type:

<script>//js operation Cookie Method!//write Cookiesfunction Setcookie (c_name, value, expiredays) {var exdate=new Date ();　　　　Exdate.setdate (exdate.getdate () + expiredays); Document.cookie=c_name+ "=" + Escape (value) + ((expiredays==null)? 　　"": "; expires=" +exdate.togmtstring ()); }//Read cookiesfunction GetCookie (name) {    var arr,reg=new RegExp ("(^|)" +name+ "= ([^;] *) (; |$) ");//Regular expressions are many, here is the regular expression of JavaScript (and PHP is different)     if (Arr=document.cookie.match (reg))         return (arr[2] );    else        return null;} Delete cookiesfunction 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 ();} Use example Setcookie (' username ', ' Darren ', ') alert (GetCookie ("username"));</script>

A third example

Attention:
The Chrome browser does not get cookies locally. Must be available on the server. If it is local, you can put it under the WWW directory.
Google Chrome only supports the reading and writing of cookies on online websites, which is forbidden for local HTML cookie operations. So the following code if you write in a local HTML file, will pop up the dialog box content is empty.
Document.cookie = "Test=cooo";
alert (Document.cookie);
If this page is the content of the online website, the cookie content test=cooo and so on will be displayed normally.
Use of JS cookies