大家看看怎么定时器清除不了,难道声明定时器只能在外面吗?

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title><script language="javascript">
var i=0;
var timer1
function test()
{  timer1=setInterval("test()",1000);
if(i>10)
  {    clearInterval(timer1);
  }
i++;
  document.getElementById("t").value=i;

}</script>
</head><body onload="test()">
<input type="text" value="" id="t" />
</body>
</html>