是一个函数返回需要被称为Closure [英] Is a function return necessary to be called a Closure

问题描述

我在YouTube上遇到这部影片 http://www.youtube.com/ watch？v = KRm-h6vcpxs

Hey i came across this video on youtube http://www.youtube.com/watch?v=KRm-h6vcpxs

这基本上解释了IIFE和闭包。但是我不知道我是否需要返回一个函数来调用它闭包。

which basically explains IIFEs and closures. But what I am not understanding is whether i need to return a function in order to call it a closure.

Ex

function a() {
    var i = 10;
    function b() {
       alert(i);
    }
}

在这种情况下，我可以将其称为闭包正在从外部函数的作用域访问'i'变量，或者我需要返回这样的函数

in this case can i call it a closure as it is accessing the 'i' variable from the outer function's scope or do i need to return the function like this

return function b(){alert(i);}

推荐答案

什么也不改变，重要的是创建它并调用它。这使得闭包，这是从内部函数到创建它的范围的链接（你可以看到它，在实践中，作为一个指针。它具有相同的效果，例如防止外部范围的混乱） 。

Returning the function changes nothing, what's important is creating it and calling it. That makes the closure, that is a link from the internal function to the scope where it was created (you can see it, in practice, as a pointer. It has the same effect of preventing the garbaging of the outer scope, for example).

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