<!DOCTYPE html>
<html>
<head>
<title></title>
<script>
var a = 1234;
console.log(typeof a); // number
a = "abcd";
console.log(typeof a); // string
a = true; // false
console.log(typeof a); // boolean
a = function () { }; // 함수(function)
console.log(typeof a); // function
console.log(typeof false); // boolean
</script>
</head>
<body>
</body>
</html>