如下代码，运行不出来。如果换成注释行代码便可以，是什么问题呢？
<!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=m.checkTime(m);
s=s.checkTime(s);
// m=m<10?"0"+m:m;
// s=s<10?"0"+s: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>
