Sample code to determine whether a client browser supports cookies

function check(){  
if(window.navigator.cookieEnabled)  
   return true;  
else{  
   alert(" Browser configuration error, Cookie Do not use! ");  
   return false;}  
}  

SetCookie('cookie_test','1');  
var cookie_test = getCookie('cookie_test');  
if( '1' != cookie_test)  
{  
 alert(' Does not support ');  
}else  
{  
 alert(' support ');  
}  

function SetCookie(name,value)//Two parameters, one is the name of the cookie, one is the value & PI;  
{  
   var Days = 30; //This cookie will be kept for 30 days & cake;  
   var exp = new Date(); //new Date("December 31, 9998");   
   exp.setTime(exp.getTime() + Days*24*60*60*1000);  
   document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();  
}  
function getCookie(name)//Cookies & cake;        
{  
   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();  
}  

var cookieEnabled=(navigator.cookieEnabled)? true : false  
//Determining whether a cookie is turned on & cake;  

//If the browser is not ie4+ or ns6+& NBSP;  
if (typeof navigator.cookieEnabled=="undefined" && !cookieEnabled){   
document.cookie="testcookie"  
cookieEnabled=(document.cookie=="testcookie")? true : false  
document.cookie="" //erase dummy value   
}