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<!DOCTYPE html>
<html lang="ko">

<head>
	<meta charset="UTF-8">
	<title>JavaScript Object Method</title>
</head>

<body>

	<h1>객체의 valueOf() 메소드</h1>

	<script>
		function func(n) {
			this.number = n;
		}

		myFunc = new func(4);
		document.write(myFunc + 5);		// ①

		func.prototype.valueOf = function() {
			return this.number;
		}
		document.write("<br><br>")
		document.write(myFunc + 5);		// ②
	</script>
	
</body>

</html>