Removes a property from an object, equivalent to delete target[propertyKey], except it won't throw if target[propertyKey] is non-configurable.
delete target[propertyKey]
target[propertyKey]
Object from which to remove the own property.
The property name.
删除一个对象的属性。
Deletes a property on an object.
Removes a property from an object, equivalent to
delete target[propertyKey], except it won't throw iftarget[propertyKey]is non-configurable.