Store, retrieve, and delete JavaScript cookies.

<SCRIPT> // author of the cookie writing function: Yan zhenkai function setcookie (name, value) // two parameters: one is the name of the cookie and the other is the value {var days = 30; // This cookie will be saved for 30 days var exp = new date (); // new date ("December 31,999 8"); exp. settime (exp. gettime () + days * 24x60*60*1000); document. cookie = Name + "=" + escape (value) + "; expires =" + exp. togmtstring ();} function getcookie (name) // The cookie function {var arr = document. cookie. match (New Regexp ("(^ |)" + name + "= ( [^;] *) (; | $) "); If (Arr! = NULL) return Unescape (ARR [2]); return NULL;} function delcookie (name) // Delete cookie {var exp = new date (); exp. settime (exp. gettime ()-1); var cval = getcookie (name); If (cval! = NULL) document. cookie = Name + "=" + cval + "; expires =" + exp. togmtstring ();} setcookie ("Xiaoqi", "3") Alert (getcookie ('xiaoqi'); </SCRIPT>