一个JavaScript变量应用实例
实例代码：
<!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>Insert title here</title>
</head>
<body>
</body>
<script type="text/javascript">
var a = "全局变量";
function aa() {
alert(a); //undefined
var a = "局部变量";
}
aa();
</script>
</html>运行结果：
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