Knowledge is a function of loading
No execution of loading will return a new vm.
Similar closures? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
So the root cause is to insert and delete elements are not the same. It can not be deleted. They need to become a common target for the job.
Become an object's method is the same: Reserved,
loading there will be a return value after execution (), the return value is vm
The loading into vm. Add and remove such perform on the same vm.
Summary:
bound to the same role of the object ,