gistfile1.js

//Include strophe, strophe.mam, strohpe.rsm

var jabber_service = "...";
var my_test_jid = "...";
var password = "...";
var my_test_target_jid = "...";

var connection = new Strophe.Connection( jabber_service );

this.connection.connect( my_test_jid, password, function (status) {

  if (status === Strophe.Status.CONNECTED) {

    connection.mam.query(my_test_jid, {
      with: my_test_target_jid,
      before: "",
      onMessage: (function(message) {
        console.log('archive message recieved', message);
        return true;
      })
    })

  }
})