Javascript--cookie

Cookie Basics in JavaScript

Pages are used to store information, such as logging in and remembering user names.

"Characteristics of cookies"

(1) Sharing a set of cookies on all pages of the same website;

(2) Limited quantity and size;

(3) Have a shelf life, expiration time (by JS Control);

(4) A cookie exists on the client.

"Cookies in JS use"

Document.cookie

"Set Cookies"

(1) Format: First name = value;

(2) will not be overwritten;

(3) Expiration Time: expires= time (use of Date object: odate=new date ());

For example:

var odate=New Date ();    // Get Time odate.setdate (odate.getdate () +30);     // setDate (): Set time document.cookie= "user=blue;expires=" +odate;   // Expires: Expiration time, here is 30 days document.cookie= "pass=123";  alert (document.cookie);

Get results:

(4) Package function

function Setcookie (name,value,iday) {     var odate=New  Date ();     Odate.setdate (Odate.getdate ()+iday);     Document.cookie=name+ ' = ' +value+ '; +expires ' +odate;} alert (Document.cookie);

Parameter meaning: Name: Custom Name

Value: Values of the first name

Iday: Expiry time

"Read Cookie"

String segmentation

 functionGetCookie (name) {//' username=abc; password=123456; aaa=111; bbb=222 '     varArr=document.cookie.split ('; ‘); varI=0; //arr->[' username=abc ', ' password=123456 ' ...]      for(i=0;i<arr.length;i++){         varArr2=arr[i].split (' = ')); //arr2->[' username ', ' abc ']         if(arr2[0]==name) {             returnArr2[1]; }     }     return‘‘; } Alert (GetCookie (' username '));

Get results:

"Delete Cookie"

function Removecookie (name) {    Setcookie (name,// Iday set to-1}

Javascript--cookie