使用 require 在另一个文件中访问 Node.js 中立即调用的函数表达式变量

Question

File 1 - Monitor.js

var MONITOR = (function () {

// File Content

return {
  doThing: function() {
    doThing();
  }
};
})();

File 2 - Test.js

var monitor = require('../public/js/monitor.js');

I want to access doThing() in File 2. I have tried various syntax and no luck so far.

From the frontend HTML I can simply include Monitor.js in a script tag, and call MONITOR.doThing(); without trouble but in Test.js this is proving difficult.

Any advice on how?

Answer 1

You have to export MONITOR so that someone else can access it with require() .

Add this:

module.exports = MONITOR;

at the bottom of Monitor.js.

---

And, if you want the monitor.doThing() method to return some value, then you have to add a return statement to the function as in:

var MONITOR = (function () {

// File Content

return {
  doThing: function() {
    return "hello";
  }
};
})();