<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script type="text/javascript">
function MarkBiBao() {
var a = 1;
return function () { alert(a); }
}
//当函数A返回函数B中，使用了函数A的局部变量，那么函数B就叫做闭包
var func = MarkBiBao();
</script>
</head>
<body>
</body>
</html>