JavaScript closures (dog blood plot, easy to understand)

Let's start by looking at a closure function:

function A () {            var i = 0;             function B () {                alert (+ +i)            ;            } return b;        }         var c = A ();        C ();        C ();        C ();

Equivalent to

function Male 1 () {            var child = 0;             function Female 1 () {                alert (+ + children )            ;            } return female 1;        }         var male 2 = male 1 ();        Male 2 ();        Male 2 ();        Male 2 ();

So then we analyze and analyze the plot of the dog's blood.

JavaScript rule : If only two people refer to each other, then the GC (Marriage Registry) will recycle this two people (PS: Province of them mess!) ）。

closure: It is three people, you have me, I have him, he has you, so complex relationship, GC is not bothered to bother the tube.

Plot:

1, male 1 Heart (scope chain scope) Female 1, female 1 belly (scope chani scope of arguments) have children male 1 and female 1 relationship

PS: If only male 1 and female 1, then it conforms to the rules of JavaScript, directly to the happy life

2, The evil Men 2 debut, male 2 also like female 1, and tell the male 1 you give her to me, male 1 really to the male 2

PS: Strongly condemn male 2 and male 1, the biggest problem is that female 1 already has a male 1 child

3, male 2 called the female 1, actually gave birth to a male 1 child

PS: The above plot true dog blood, so closures, not special environment do not use, hehe ~ ~

JavaScript closures (dog blood plot, easy to understand)