What are the drawbacks of deep copying in json.stringify() in JavaScript?

There are several drawbacks to using JSON.stringify() for deep cloning:

1. Circular references cannot be processed: JSON.stringify() will throw an exception when there is a circular reference in an object, meaning when a property of the object points to the object itself.
2. Cannot copy non-enumerable properties and methods: JSON.stringify() can only copy the object’s own enumerable properties and will ignore functions and properties of type Symbol.
3. Special object properties cannot be copied: JSON.stringify() does not copy properties on the object’s prototype chain.
4. When dealing with date objects, converting them to JSON strings and then parsing with JSON.parse() will result in the date object becoming a string instead of creating a new date object.
5. Unable to handle regular expression objects: Regular expression objects become empty objects after being converted to JSON strings.
6. JSON.stringify() cannot handle undefined and functions, it will directly convert them to null.
7. JSON.stringify() cannot handle Infinity and NaN, so it will convert them to null.

It is important to note that JSON.stringify() only performs a shallow copy, which means it copies the reference of an object rather than its value. If the property values of the object are objects or arrays, the copied object will still point to the original object’s properties and not create new objects. Therefore, if a deep copy is needed, one must write a recursive function themselves or use other libraries to achieve it.