js操作cookie

document.cookie = "sex=" + encodeURIComponent(name);

document.cookie = "sex=";

　　　　function getCookie(c_name){
            if (document.cookie.length>0)
              {
              c_start=document.cookie.indexOf(c_name + "=")
              if (c_start!=-1)
                { 
                c_start=c_start + c_name.length+1 
                c_end=document.cookie.indexOf(";",c_start)
                if (c_end==-1) c_end=document.cookie.length
                return decodeURI(document.cookie.substring(c_start,c_end))
                } 
              }
            return ""
        }