js deep copy of the array, object, copying the

Basic types of data are stored in the stack memory, the reference data type is stored in the heap memory

Basic types: Number Boolean undefined String Null

Reference types: Object Function

 

Object js objects and arrays are reference types Array

 

When using a reference type variable declaration, in fact, this is not a reference type variable itself, but rather a reference point to this type of pointer. The pointer to the heap memory in the memory address of the object. Process copied to another object is to actually copy the address of the object to another object variable, both pointers point to the same object, thus changing one, the other will change, particularly as shown below

 

That clone, if necessary depth: JSON.parse (JSON.stringify (data));