HTML5 Web Application Development By Example Beginner's guide

Time for action – creating the JavaScript file

Let's move on to the JavaScript file, app.js. Here we'll stub out a basic outline for our application template. If you don't know what the dollar signs are for, they are aliases for the jQuery library. We'll go over some jQuery basics in a moment.

"use strict";

function MyApp()
{
    var version = "v1.0";

    function setStatus(message)
    {
        $("#app>footer").text(message);
    }
    
    this.start = function()
    {
        $("#app>header").append(version);
        setStatus("ready");
    };
}

Starting at the top we will include "use strict" in our JavaScript files. This informs the JavaScript runtime to use newer and stricter standards when running our code. For example, in older versions of JavaScript it was completely legal to use a variable ...