Fix of https://gist.github.com/Senci/dcdff71e6197b4af1154

phridgePersistence.js

var phridge = require('phridge');

var simpleLogScript = require.resolve('./simpleLogScript.js');
var phantomInstances = {};

function spawnPhantom(id) {
  return phridge.spawn()
    .then(function (phantom) {
      phantomInstances[id] = phantom;

      return phantom.run(function () {
        this.page = webpage.create();
        this.page.onCallback = console.log.bind(console);
      })
    })
    .then(function () {
      console.log('Phantom instance ('+ id +') successfully spawned.');
    });
}

spawnPhantom('myId0')
  .then(function () {
    return phantomInstances['myId0'].run(simpleLogScript, function (scriptPath) {
      this.page.injectJs(scriptPath);
    });
});

simpleLogScript.js

window.callPhantom('Hello World!');