<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
//전역변수
var a=10;
var b=100;
function outer() {
//지역변수
var a=20;
document.write("3.outer a="+a+"<br>");
document.write("4.outer b="+b+"<br>");
}
//전역변수 호출
document.write("1.a="+a+"<br>");
document.write("2.b="+b+"<br>");
//outer 호출
outer();
</script>
</head>
<body>
</body>
</html>
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