Interface Port

workerPort.onerror = function( error )
{
   // We've got an error !
   console.log('Error message: '+ error.message);
   console.log('From file: '+ error.filename);
   console.log('Line: '+ error.lineno);
}

workerPort.onmessage = function( message )
{
    // We've got a message !
    // The `message.data` is what the worker proxy sends using `postMessage()`. Could be a String, Number or an Object type.
    // Here, `message.data` contains an object: `{type: String, says: String}`
    var action = message.data;
    switch( action.type )
    {
        // It's a hello world message
        case 'hello':
            // Reply to the worker proxy
            workerPort.postMessage( {type: 'hello', says: 'Hello to you too!'} );
            break;

        // It's a terminate message
        case 'close':
            // Reply to the worker proxy
            workerPort.postMessage( {type: 'close', says: 'I will be back!'} );
            // Close the worker
            close();
            break;
    }
}

Example 1: From a worker proxy

// Create a new SharedWorker and get the proxy worker
var myProxyWorker = new SharedWorker("backend/worker.js", "my-worker-name");
// Get the proxy worker port for communication
var proxyWorkerPort = myProxyWorker.port;
// Send a "wake up" message to the worker
proxyWorkerPort.postMessage('wake-up');

Example 2: From a worker

// worker.js
onconnect = function( msg )
{
    // Get the worker port for communication with the worker proxy
    var workerPort = msg.ports[0];

    // Send a message to the worker proxy. The worker is up and running.
    workerPort.postMessage({type: 'connected', says: 'Hello world!'});
}