use*_*946 1 javascript scope function public
为什么警告打印2在下面的例子中？var a未知函数n ...
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>Test Doc</title>
<script type="text/javascript">
var a = 1;
function f() {
var a = 2;
function n() {
alert(a);
}
n();
}
f();
</script>
</head>
<body>
</body>
</html>