JS's closure

Reference: http://kingsmalltwo.iteye.com/blog/1962583

function A () {  var i=0;  Alert (' a ');  Function B () {    alert (++i);  }  return b;} var C = a (); C (); C ();

According to previous experience: Var c=a (), this sentence is to assign a function a () to C, but unfortunately in JS, is to return the value of B () assigned to C, here is the function of a ().

Summarize:

1, the outer layer of the closure is a function.

2, there are functions inside the closure.

3, the closure will return the intrinsic function.

4, there must be no return inside the function returned by the closure. (because it's really over.)

5, when the closure is executed, the inner variables of the closure are present, and the inner variables of the inner functions of the closure are not present.