JS获取客户端系统当前时区

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<script> function getClientTimezone(){    var oDate = new Date();    var nTimezone = -oDate.getTimezoneOffset() / 60;    return nTimezone.toFixed(2);  }  alert(getClientTimezone()); </script>   <script type="text/javascript">     var d = new Date();     document.write(-d.getTimezoneOffset()/60); </script>