JavaScript Cookie

 function addCookie(name,value,expiresHours){ 
     var cookieString=name+"="+escape(value); 
     //判断是否设置过期时间 
     if(expiresHours>0){ 
         var date=new Date(); 
         date.setTime(date.getTime+expiresHours*3600*1000); 
         cookieString = cookieString + "; expires=" + date.toGMTString() + ";path=/"; 
     } 
     document.cookie=cookieString; 
 }

 function getCookie(name){ 
     var strCookie=document.cookie; 
     var arrCookie=strCookie.split(";"); 
     for(var i=0;i<arrCookie.length;i++){ 
         var arr=arrCookie[i].split("="); 
         if (arr[0] == name)
             return arr[1];
     } 
     return ""; 
 }

 function deleteCookie(name) {
     var date = new Date();
     date.setTime(date.getTime() - 10000);
     document.cookie = name + "=v; expires=" + date.toGMTString() + ";path=/";;
 }