Using a JavaScript file in another JavaScript file [duplicate]

Question

I am writing some JavaScript files that will not be used with HTML documents. For example, writing a calculator in one JavaScript file, where I'll have different .js files say one for addition, subtraction, multiplication, division, etc..

I'd like to have each math operation in a self contained .js file then have another .js file that will #include the other smaller files and can call the functions from them?

Is that possible?

Answer 1

Using javascript:

var script = document.createElement('script');
script.src = '/js/script';
document.head.appendChild(script);

Using jQuery:

//you need to change your path
$.getScript('/js/script.js', function()
{
    // script is imported

});

Answer 2

Here is a synchronous version:

function myRequire( url ) {
    var ajax = new XMLHttpRequest();
    ajax.open( 'GET', url, false ); // <-- the 'false' makes it synchronous
    ajax.onreadystatechange = function () {
        var script = ajax.response || ajax.responseText;
        if (ajax.readyState === 4) {
            switch( ajax.status) {
                case 200:
                    eval.apply( window, [script] );
                    console.log("script loaded: ", url);
                    break;
                default:
                    console.log("ERROR: script not loaded: ", url);
            }
        }
    };
    ajax.send(null);
}

Note that to get this working cross-domain, the server will need to set allow-origin header in its response.