Web Worker for Blob string

gistfile1.js

var blob = new Blob(["onmessage = function(e) { postMessage('msg from worker'); }"]);

// Obtain a blob URL reference to our worker 'file'.
var blobURL = window.URL.createObjectURL(blob);

var worker = new Worker(blobURL);
worker.onmessage = function (e) {
    alert(e.data)
};
worker.postMessage('data');