这个代码怎么在IE上没反应 点击按钮
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div id="box">
<input id="btn" type="button" value="按钮">
</div>
<script>
var c=document.getElementById("btn");
function show(){
alert("hello");
}
c.attachEvent('onclick',show);
</script>
</body>
</html>
