有什么方法可以在 Javascript 中访问外部作用域中的局部作用域变量？

Question

Is there any way to make local scope variable accessible in outer scope without creating an object or without using 'this'?

Say,

function foo(){
  var bar = 10;

}

Any way to make variable 'bar' available outside function 'foo' scope?

Answer 1

No. Simply you can't. Scope is scope . If you want to access outside, make it declare outside and use it.

That's how things designed. I don't suggest any crappy way to make it possible.

Answer 2

Assign the value to a property of the window object:

function foo(){
    window.bar = 10;
}

console.log(window.bar); //10

EDIT:

Since you can't accept his answer, then no - what you're asking for is impossible. Only solution is to declare the variable in the global scope, then initialize it later.

Answer 3

You can't access local variable outside the function.

Following post might help you to understand scopes in more detail -

What is the scope of variables in JavaScript?

Answer 4

You can do something like this:

var myScopedVariables = function foo(){
    var bar = 10;
    return [bar];
} 
console.log(myScopedVariables);