Load a remote javascript file in the browser synchronously. Wait till loading complete with callback.

async-script-loader.js

//Example: log 'Hello World' after language-colors.css load completed 
/**
  loadScript("https://quickutils.github.io/language-colors/language-colors.css", function() {
	  console.log('Hello World');
  });
**/

function loadScript(url, callback) {
    var head = document.body;
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = url;
    script.onreadystatechange = callback;
    script.onload = callback;
    head.appendChild(script);
}