程序代码:<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<head>
<title>test</title>
<script type="text/javascript">
function kit(){
var szString = document.window_name.value || b_c_c_n;
}
document.btn.onchange = kit;
</script>
</head>
<body>
<input type="button" name="btn" value="open window"></input>
<input type="text" name="window_name" size="20"></input>
</body>
</html>为什么 取不到 btn 和 window_name对象
Firebug msg: document.btn is undefined
Line 9


