in this case var keyword is not working in function block.why??

Question

if(true){
var aa="vardhan123";
}
console.log(aa)

function war(){
var bb="hello world";
}
war()
console.log(bb)

Answer 1

var bb declares the variable within function war() but not globally so cannot reference it outside of the function

Answer 2

Yes we cannot access variable defined in function scope. It will call as local variable. To access you need to make global variable.

Answer 3

Variables declared by var are function-scoped. To declare a global variable use window object. Like this

function war(){
window.bb="hello world";
//Or just
bb="hello world";
}
war()
console.log(bb)