Adhering to the vision of the world's most difficult-to-understand technology, we will launch directly
First of all, Object.defineProperty() can be understood as the operation (read/write) of properties in another object through an object proxy
Of course, it can also be an object agent operating on the value of a variable
This sentence may be a mouthful, read it several times, if you really don’t understand it, just look at Example 2
Don't talk nonsense and go directly to the code
Detailed legend
Here is a person proxying the value of number === Of course, it can also be an object proxying the value operation of a variable
The three parameters of Object.defineProperty() are:
person : To add a key to that object
'age' : newly added key name// Note that this is a string
{} : The third parameter is an object, which contains get and set methods
Example 2:
Here is the operation of an object proxy on the properties of another object
Note: At this time, obj2 uses the value of x in obj, but x in boj2 is the newly added key for obj2. Instead of using x in obj directly.
Other configuration items
value: value,
enumerable: true, // enumerable indicates whether it can be enumerated, the added property name cannot be read when traversing, the default value is false
writable: true, //Whether the control attribute can be modified, the default value is false
configurable: true, // Control whether the attribute can be deleted, the default value is false
Note that the above configuration cannot coexist with the get() and set() methods, otherwise the following error will be reported
Uncaught TypeError: Invalid property descriptor. Cannot both specify accessors and a value or writable attribute, #<Object>
at Function.defineProperty (<anonymous>)
