js cookie删除，增加，修改

js cookie删除，增加，修改

function getcookie(n) {
     var dc = "; "+document.cookie+"; ";
     var coo = dc.indexOf("; "+n+"=");
     if (coo!=-1){
      var s = dc.substring(coo+n.length+3,dc.length);
      return unescape(s.substring(0, s.indexOf("; ")));
     }else{
      return "";
     }
}
function setcookie(cookieName, cookieValue, seconds, path, domain, secure) {
    var expires = new Date();
    seconds = seconds ? seconds : 24*60*60*1000;
    expires.setTime(expires.getTime() + seconds);
    expires = is_Moz ?  expires.toUTCString() : expires.toGMTString();
    document.cookie = escape(cookieName) + '=' + escape(cookieValue)
     + (expires ? '; expires=' + expires : '')
     + (path ? '; path=' + path : '/')
     + (domain ? '; domain=' + domain : '')
     + (secure ? '; secure' : '');
}
function  deletecookie(cookieName,path, domain){
     var exp = new Date(); 
     exp.setTime(exp.getTime() - 10000); 
     var cval=getcookie(cookieName);  
     if(cval!=null)
     { 
         document.cookie = escape(cookieName) + '=aa'
         + ('; expires=' + exp.toGMTString())
         + (path ? '; path=' + path : '/')
         + (domain ? '; domain=' + domain : '')
     }
}