setInterval不能传参,但是,可以通过匿名函数传参

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script>
window.onload=function(){
    
var oTxt=document.getElementById("txt");
var timer=null;
var i=0;
function show(s){
    i+=s;
    oTxt.innerHTML=i;
    }
timer=setInterval(function(){show(1);},10);
};
</script>
</head>

<body>
<p id="txt">
</p>
</body>
</html>