Clone object in JavaScript

Clone.js

'use strict';
function clone(obj) {
	if (obj == null || typeof obj != "Object") {
		return obj;
	}
	let copy = obj.constructor();
	for (let attr in obj) {
		if (obj.hasOwnProperty(attr)) {
			copy[attr] = obj[attr];
		}
	}
	return copy;
}