如何在JavaScript中的另一个函数中调用函数

Question

I have created nested function in one script file A.js, like below:

function A(){
   function B(){}
}

If I want to call function B() in another script file C.js, what should I do?

Answer 1

What you want to do seems to be to create a function closure of B using the variables within A() . You can then access this closure B if you return B after you call A() . Then, in C.js , you can access B by calling A and using the return value:

A.js :

function A([parameters]) {
    [variables]
    function B() { [function body] }
    //Return B from A:
    return B;
}

C.js :

//Get B:
var bFunction = A([parameters]):
//Call bFunction:
bFunction();

Answer 2

You have to return the nested function:

function A(){
   return function B(){}
}

Then In C.js

var funB = A();
funB();

or

A()();

Answer 3

You have to return the nested function B() from the parent function A() .

Your code

function A(){
   function B(){}
}

Updated Code with return statement

function A(){
    return function B(){ //return added

 }     
 }

You can access the child function by adding an additional () Parentheses to the function call like the below example.

A()();