Using JavaScript files in NativeScript

问题

I am learning NativeScript. As part of that, I'm trying out a basic project. In that project, I'm trying to use a JavaScript file that I use for string manipulation. This file does NOT require access to browser elements like the DOM. Yet, I can't run my app when I include the file. At this time, I have the following in my ./app/home/index.js file:

var MyFile = require('../app/code/myFile.js');
...
var prefix = myFile.GetPrefix(someStringValue);

For more background:

1. I've included the file in ./app/code/myFile.js.
2. I've referenced the file as shown above

Here is what myFile.js looks like:

function MyClass() {}
module.exports = MyClass;
MyClass.test = function(msg) {
  console.log(msg);
};

How can I use some existing JavaScript in a NativeScript app?

Thank you!

回答1:

You need an instance of MyClass in index.js. You can instantiate MyClass either in:

1. index.js:

   var myFileModule = require('../app/code/myFile.js');

   var myFile = new myFileModule.MyClass();

OR...

2. myFile.js:

   module.exports = new MyClass();

:: Note that if you do #2 above, in your code...

var MyFile = require('../app/code/myFile.js');

... the MyFile variable already IS an instance of MyClass.

:: A small, unrelated suggestion on coding style: It's better to name your variable(s) myFile instead of MyFile (note the first lowercase letter in myFile)...

来源：https://stackoverflow.com/questions/31482486/using-javascript-files-in-nativescript