This file demonstrate using web worker to compress the data at frontend side (step 2)

using-web-worker-step-2.js

$.ajax({
    url: workerUrl,
    dataType: 'text',
    success: function (data) {
        try {
            // Create a blob of the file content, so that we can create blob URL out of it, that can
            // be passed to create a web worker file (that runs in the background thread)
            var blob =  new window.Blob([data], {type: 'text/javascript'});
            workerBlobUrl = window.URL.createObjectURL(blob);

			// workerBlobUrl now is the URL to worker file, now we need to create a web worker using this URL.
        } catch (e) {
            console.log('Error in initializing worker file');
        }
    }
});