浅拷贝和深拷贝 ​

function clone(target) {
	if (typeof target !== 'object') return target;
	const newObject = {};
	for (var key in target) newObject[key] = target[key];
	return newObject;
}

function deepClone(target) {
	if (!(target instanceof Object)) return target;

	if (Array.isArray(target)) {
		let res = [];
		target.forEach((item) => {
			res.push(deepClone(item));
		});

		return res;
	}
	const newObject = {};

	for (let key in target) {
		let value = target[key];

		if (typeof value === 'function') {
			newObject[key] = value.bind(newObject);
		} else if (typeof value === 'object') {
			if (Array.isArray(value)) {
				newObject[key] = [];

				value.forEach((item) => {
					newObject[key].push(deepClone(item));
				});
			} else {
				newObject[key] = deepClone(value);
			}
		}
	}
	return newObject;
}