function FakeWorker(path) {
function InternalWorker() {
var __w = this;
var messageq = [];
__w.postMessage = function(m){messageq.push(m);};
this.__bindBody = function(data){
var __win = { postMessage : function(m){
if(__w.onmessage){
setTimeout(function(){ __w.onmessage({data: m});}, 1);
}
}
};
with(__win){
eval(data);
__w.postMessage = (onmessage)
? function(m) { setTimeout(function() {onmessage({data: m+” (via FakeWorker)”});}, 1); }
: function(){};
for(var i=0,msg;msg=messageq[i];i++){
__w.postMessage(msg);
}
}
}
}

var iworker = new InternalWorker();
$.get(path, function(data) {
iworker.__bindBody(data);
});
return iworker;
}

I didn’t want to define the “Worker” class, just because that felt a little misleading to me. Instead, this is how I use it:

var w = (typeof(Worker)===’undefined’)
? new FakeWorker(“Worker.js”)
: new Worker(“Worker.js”);