The difference between a JavaScript reference type and a base type

JavaScript variables can be used to hold two types of values: the base type value and the reference type value.

There are 5 types of base type values: Undefined,null,boolean,number,string

There are two types of reference type values: Functions, objects.

Characteristics of base type values and reference type values:

1, the basic type value in memory occupies a fixed size of space, so is stored in the stack memory;

2, from one variable to another copy of the basic type of value, will create this worth a copy;

3, the value of the reference type is an object, stored in the heap memory;

4. A variable containing a value of a reference type actually contains not the object province, but a pointer to the object;

5. The value of the copied reference type from one variable to another, and the pointer is copied, so two variables end up pointing to the same object;

6. Determine which base type a value can use the TypeOf operator, and determine which reference type can use the instanceof operator.

The difference between a JavaScript reference type and a base type