javascript：无法访问成员函数

Question

NEWBIE question.

I cannot access member function. What am I doing wrong?

index.js ->
var abc = require('./def');
var foo = new abc();
foo.zxc(); 

def.js ->
var bar = function(){
// do something
    var zxc = function(){
        // do something
    }
}
module.exports = def;

When I run in brwoser console it shows :

TypeError:foo.zxc is not a function

Answer 1

Because zxc is just a local variable not accessible from outside of the the bar function. You can change it to

var bar = function() {
   // do something
    this.zxc = function(){
        // do something
    }
}

Now, zxc is an own property of the constructed object so it will work.

Answer 2

Try something like the following:

// index.js ->
var abc = require('./def');
var foo = new abc.bar();
foo.zxc(); 

// def.js ->
var bar = function(){
// do something
    this.zxc = function(){
        // do something
    }
}
module.exports.bar = bar;

The main difference is you are now exporting the bar() {...} constructor which can then be used off of the abc required in module?