JavaScript from Getting started to mastering (i)

1.

Heap: Heap Reference value
Stack: Stack advanced after the value is the copy of the relationship

Immutable Original value: number String Boolean undefined null stack
Reference value: Array Object function ... date RegExp (regular) heap

var arr =[1,2];
var arr1 = arr;
Arr.push (3);
Console.log (ARR1); ==>

var arr =[1,2];
var arr1 = arr;
arr = [1,3];
Console.log (ARR1); ==>

2.

var num = 100;
var num1 = num;
num = 200;

JavaScript from Getting started to mastering (i)