javascript 客户端时区、语言的获取

<script type="text/javascript">

 var d, tz, s = "";
 d = new Date();
 tz = d.getTimezoneOffset();
 tz = tz*(-1);
 
 if(tz < 0) {
 s = s + 'GMT-';
 tz = tz * (-1);
 }
 else s = s + 'GMT+';
   
 if(tz >= 0) {
 var hour = Math.floor(tz/60);
 
 var minute = tz - Math.floor(tz/60) * 60;
 if(hour < 10) s = s + "0" + hour;
 else s = s + hour;
 s = s + ':';
 if(minute < 10) s = s + "0" + minute;
 else s = s + minute;
 
 alert(s);
 alert('window.navigator.userLanguage:' + window.navigator.userLanguage);
 alert('window.navigator.systemLanguage:' + window.navigator.systemLanguage);
 alert('window.navigator.browserLanguage :' + window.navigator.browserLanguage );
 var language = window.navigator.language;
 alert('window.navigator.language:' + window.navigator.language);
 if(!language){
    language = window.navigator.browserLanguage;
    alert('firefox window.navigator.browserLanguage:' + window.navigator.browserLanguage);
  }
}

 </script>