Person instance by object

<script type="text/javascript">
	Person.prototype.setPerson = function(x){
		this.firstName = x.firstName;
		this.lastName = x.lastName;
		this.job = x.job;
	}

	function init() {
		var wife = new Person();
		wife.setPerson({
			firstName: "Joan",
			lastName: "Leach",
			job: "Teacher"
		});
		wife.writePerson(3);		
	}
</script>