js检测浏览器cookie是否开启

<script>     
  function CookieEnable()   {   
        var result=false;   
        if(navigator.cookiesEnabled)  return true;   
  
        document.cookie = "testcookie=yes;";   
  
        var cookieSet = document.cookie;   
  
        if (cookieSet.indexOf("testcookie=yes") > -1)  result=true;   
          
         document.cookie = "";   
           
        return result;   
}   
  
      if(!CookieEnable()){   
        alert("对不起，您的浏览器的Cookie功能被禁用，请开启");         
      }   
</script>