JavaScript获取目前系统时间

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<script type="text/javascript">
var now = new Date();
var year = now.getYear();
var month =now.getMonth()+1;
var day = now.getDate();
var hour = now.getHours();
var minute  = now.getMinutes();
var second = now.getSeconds();
alert(year+"-"+month+"-"+day+" "+hour+":"+minute+":"+second);
</script>