Why i used two variables , one didnot declar ,but didnot get global-variables?

Question

First :

function A() {

        for (var i = 0; i < 10; ++i) {
            //...
        }
        console.log(i); //i is undefined
       // i dont get global i
        for (i = 0; i < 10; ++i) {
            //...
        }

    }

When i execute A() , i donot get global var i . But this:

    function B() {
       // i get global i
        for (i = 0; i < 10; ++i) {
            //...
        }
     }

When i execute B() , I get global i . So why i cannot get the global when i execute A() ?

coz its not global variable. its only working inside for statement. — Josua Marcel C, Jul 13 '15 at 01:35
check this http://www.w3schools.com/js/js_loop_for.asp , you don't need to initial the variable for FOR STATEMENT — Josua Marcel C, Jul 13 '15 at 06:50

Richard Kho · Answer 1 · 2015-07-13T02:03:16.313

0

i is never globally scoped in your code. It is lexically scoped only within the confines of your A function.

edited Jul 13 '15 at 02:03

answered Jul 13 '15 at 01:36

Richard Kho

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2

it is actually scoped inside the function A() – Jaromanda X Jul 13 '15 at 02:00

Why i used two variables , one didnot declar ,but didnot get global-variables?

1 Answers1