JavaScript 对象克隆：`newObjj` 与 `obj` 属性差异的原因

There could be several reasons why the properties of newObjj and obj may differ after cloning. Here are a few possibilities:

1. Deep cloning: If the object obj contains nested objects or arrays, a shallow cloning method like JSON.parse(JSON.stringify(obj)) may not fully clone the nested objects. In such cases, you might need to use a deep cloning technique to ensure that all properties are cloned correctly.

2. Object references: If the object obj contains properties that are references to other objects, the cloning process may not create new copies of those referenced objects. Instead, the cloned object will still refer to the same objects as the original object. This means that any modifications made to the referenced objects will be reflected in both the original and cloned objects.

3. Non-enumerable properties: If the object obj contains non-enumerable properties, such as properties defined with Object.defineProperty(), those properties may not be cloned using the JSON.parse(JSON.stringify(obj)) method. These properties are not included in the serialization and deserialization process performed by JSON.stringify() and JSON.parse().

To accurately determine the cause of the differing properties, it would be helpful to provide more information about the specific properties that are different and the structure of the obj object.