1. The advantages of Proxy are as follows:
1. Proxy can directly monitor the object's non-attribute.
2. Proxy can directly monitor the changes of the array.
3. Proxy has as many as 13 interception methods, not limited to apply, ownKeys, deleteProperty, has, etc. Object.defineProperty does not have.
4. Proxy returns a new object, we can only manipulate the new object to reach the target, but Object.defineProperty can only traverse the object properties and modify it directly.
5. Proxy as a new standard will be subject to continuous performance optimization by browser vendors, which is the performance bonus of the legendary new standard.
2. The advantages of Object.defineProperty are as follows:
1. Good compatibility, support IE9.