How to get URL Parameters into HTML Canvas?

Here's a javascript function that reads the URL parameters and makes them usable for javascript.  How can I adapt this for use inside a HMTL Canvas in Adobe Animate?  I have tried unsuccessfully.

function GetURLParameter(sParam)
{
    var sPageURL = window.location.search.substring(1);
    var sURLVariables = sPageURL.split('&');
    for (var i = 0; i < sURLVariables.length; i++) 
    {
        var sParameterName = sURLVariables[i].split('=');
        if (sParameterName[0] == sParam) 
        {
            return sParameterName[1];
        }
    }
}​

// Retrieve Parameters and set Variables
var lab = GetURLParameter('lab');
var sec = GetURLParameter('sec');

Help much appreciated. I'm new to Animate, and have been searching for the solution.

Cheers,

Geoff