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>