javascript获取系统当前时间

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我对蝉说:他日再见,要待来年. 蝉对我说:他日重逢,要等来生 
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<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>当前系统时间</title>
<link rel="stylesheet" href="style.css"  />
<script language="javascript" type="text/javascript">
  window.onload = function(){
    showTime();
  }
  function checkTime(i){  //补位处理
    if(i<10)  {
        i='0'+i;
    }
    return i;
  }
  function showTime(){
    var now=new Date();
    var year= now.getFullYear()  ;
    var month=  now.getMonth()+1 ;
    var day=  now.getDate()  ;
    var h=  now.getHours()  ;
    var m=  now.getMinutes()  ;
    var s=  now.getSeconds()  ;
    m=checkTime(m)
    s=checkTime(s)

    var weekday=new Array(7)
    weekday[0]="星期日"
    weekday[1]="星期一"
    weekday[2]="星期二"
    weekday[3]="星期三"
    weekday[4]="星期四"
    weekday[5]="星期五"
    weekday[6]="星期六"

    document.getElementById("show").innerHTML=""+year+"年"+month+"月"+day+"日 "+  weekday[now.getDay()] +h+":"+m+":"+s;
    t=setTimeout('showTime()',500)
  }
</script>
</head>
<body>
<div class="content1">
  <div id="show">显示时间的位置</div>
</div>
</body>
</html>