Introduction to Common JS APIs

Object.defineProperty

In JS objects, you can define a descriptor for each object field, which can be understood as controlling the behavior of the object property, such as readable, writable, enumerable, configurable, and so on.

The descriptor fields supported by a property are as follows:

Descriptor field	Function	Default value
configurable	Whether the descriptor fields (including itself) can be modified	false
enumerable	Whether this field can be enumerated in iterators If set to false, it cannot be picked up by Object.keys, Object.values, for ... in, Object.assign, ..., and so on	false
value	The default value of the field	undefined
writable	Whether the property value can be modified When set to false, assigning to the property throws in strict mode	false
get	The field's getter, triggered when the value is read	undefined
set	The field's setter, triggered when the value is set	undefined

set + get cannot coexist with value + writable; their functionality overlaps