ionic-framework/demos/config/index.ts

if (!window.localStorage) {
  Object.defineProperty(window, "localStorage", new (function () {
    var aKeys = [], oStorage = {};
    Object.defineProperty(oStorage, "getItem", {
      value: function (sKey) { return sKey ? this[sKey] : null; },
      writable: false,
      configurable: false,
      enumerable: false
    });
    Object.defineProperty(oStorage, "key", {
      value: function (nKeyId) { return aKeys[nKeyId]; },
      writable: false,
      configurable: false,
      enumerable: false
    });
    Object.defineProperty(oStorage, "setItem", {
      value: function (sKey, sValue) {
        if(!sKey) { return; }
        document.cookie = escape(sKey) + "=" + escape(sValue) + "; expires=Tue, 19 Jan 2038 03:14:07 GMT; path=/";
      },
      writable: false,
      configurable: false,
      enumerable: false
    });
    Object.defineProperty(oStorage, "length", {
      get: function () { return aKeys.length; },
      configurable: false,
      enumerable: false
    });
    Object.defineProperty(oStorage, "removeItem", {
      value: function (sKey) {
        if(!sKey) { return; }
        document.cookie = escape(sKey) + "=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/";
      },
      writable: false,
      configurable: false,
      enumerable: false
    });
    this.get = function () {
      var iThisIndx;
      for (var sKey in oStorage) {
        iThisIndx = aKeys.indexOf(sKey);
        if (iThisIndx === -1) { oStorage.setItem(sKey, oStorage[sKey]); }
        else { aKeys.splice(iThisIndx, 1); }
        delete oStorage[sKey];
      }
      for (aKeys; aKeys.length > 0; aKeys.splice(0, 1)) { oStorage.removeItem(aKeys[0]); }
      for (var aCouple, iKey, nIdx = 0, aCouples = document.cookie.split(/\s*;\s*/); nIdx < aCouples.length; nIdx++) {
        aCouple = aCouples[nIdx].split(/\s*=\s*/);
        if (aCouple.length > 1) {
          oStorage[iKey = unescape(aCouple[0])] = unescape(aCouple[1]);
          aKeys.push(iKey);
        }
      }
      return oStorage;
    };
    this.configurable = false;
    this.enumerable = true;
  })());
}

var CONFIG_DEMO = null;

if (window.localStorage.getItem('configDemo')) {
  CONFIG_DEMO = JSON.parse(window.localStorage.getItem('configDemo'));
}

import {App, Page, IonicApp, Platform, NavController} from 'ionic-angular';

@App({
  template: '<ion-nav id="nav" [root]="rootPage" #content></ion-nav>',
  config: CONFIG_DEMO || {}
})
class ApiDemoApp {

  constructor() {
    this.rootPage = TabPage;
  }
}

@Page({
  templateUrl: 'tabs.html'
})
export class TabPage {
  constructor() {
    this.tabOne = InitialPage;
  }
}


@Page({
  templateUrl: 'main.html'
})
export class InitialPage {
  constructor(platform: Platform, nav: NavController) {
    this.platform = platform;
    this.nav = nav;

    if (window.localStorage.getItem('configDemo') !== null) {
      this.config = JSON.parse(window.localStorage.getItem('configDemo'));
    }
    else if (platform.is('ios')) {
      this.config = {
        'backButtonIcon': 'ios-arrow-back',
        'iconMode': 'ios',
        'tabbarPlacement': 'bottom'
      };
    } else {
      this.config = {
        'backButtonIcon': 'md-arrow-back',
        'iconMode': 'md',
        'tabbarPlacement': 'top'
      };
    }

    this.initialConfig = JSON.parse(JSON.stringify(this.config));
  }

  load() {
    window.localStorage.setItem('configDemo', JSON.stringify(this.config));
    window.location.reload();
  }

  push() {
    this.nav.push(AnotherPage);
  }
}

@Page({
  templateUrl: 'page.html'
})
export class AnotherPage {
  constructor(nav: NavController) {
    this.nav = nav;

  }

  pop() {
    this.nav.pop();
  }
}