全局对象的预定义属性
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>demo 1</title>
<style type="text/css">
</style>
<script type="text/javascript">
}
function on(){
var v = "";
for (var name in this)
{
v+=name+"\n";
}
alert(v);
}
</script>
</head>
<body onLoad="javascript:on();">
</body>
</html>
